Answer:
12.5g
Explanation:
1. Percentage of solution = 5.
2. Mass of solution = 250g.
3. = Mass of solute / 250 x 100.
4. = 5 x 250 / 100.
5. = 12.5g.
Consider the reaction below.
2Al2O3 --> 4Al + 3O2
How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed?
(a) 17.7 mol
(b) 19.9 mol
(c) 39.8 mol
(d) 53.0 mol
Answer:
(b) 19.9 moles
Explanation:
To convert from moles Al to moles O₂, you need to multiply the given value by the mole-to-mole ratio of each component. This ratio is constructed via the coefficients in the balanced reaction. The desired unit (moles O₂) should be placed in the numerator to allow for the cancellation of units.
2 Al₂O₃ ----> 4 Al + 3 O₂
^ ^
26.5 moles Al 3 moles O₂
--------------------- x ---------------------- = 19.9 moles O₂
4 moles Al
An electron on an energy level has an energy of 16.32 x 10−19 J. It moves to another level by absorbing 5.4 x 10−19 J of energy. Which of the following descriptions most likely explains what occurred?
The electron moved down to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved down to an energy level and has an energy of 21.72 x 10−19 J.
The electron moved up to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Answer:
The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Explanation:
i know
Answer:
D) The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Explanation:
I took the test and got it right.
Please help, I don't know the formulas to do these and I'd like to know HOW y'all get the answers...thank you so much.
A technician produced H2 gas by reacting zinc (Zn) with sulfuric acid (H2SO4). The reaction was: 2Zn (s) + H2SO4 (aq) ----> Zn2SO4 (aq) + H2
He collected the hydrogen in a flask by water displacement. Atmospheric pressure was 737.2 torr, and room temperature was 25.0 degrees celsius.
a. What was the vapor pressure in the water flask?
b. What was the pressure of H2 in the flask?
c. Suppose that a leak in the gas collection tubes accidentally let a small amount of air into the flask. The unwanted air exerts 25.2 torr of pressure in the flask. How much pressure is the H2 exerting in the flask?
The vapour pressure in the water flask is 23.686 torr.
The pressure of [tex]H_2[/tex] in the flask was 713.514 torr.
Pressure is the [tex]H_2[/tex] exerting in the flask is 688.314 torr
What is vapour pressure?Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature.
a.The vapour pressure of water is given by:
[tex]Log_{10} P =A- \frac{B}{C+T}[/tex], where T is in degree Celcius, P is in torr.
For 0-100 degree celcius, A=8.07131, B=1730.63, C=233.426
[tex]Log_{10} P = 8.07131 - \frac{1730.63}{233.426+25} =1.3745[/tex]
As T =25 degree celcius
[tex]P = 10^{1.3745} torr[/tex] =23.686 torr
b.We know that [tex]P_{total} =P_{H_2} + P_{H_2O}[/tex]
[tex]P_{total}[/tex] = Atmospheric pressure
[tex]737.2 torr = P_{H_2} +23.686 torr[/tex]
[tex]P_{H_2} = 713.514 torr[/tex]
c.After there is a leak in the gas collection tube, the amount at pressure due to water vapour remains unchanged as it is a quantity dependent on temperature.
[tex]P_{total} =P_{H_2} + P_{H_2O} + P_{leaking \;air}[/tex]
[tex]737.2 torr = P_{H_2} + 23.686 torr + 25.2 torr[/tex]
[tex]P_{H_2} =688.314 torr[/tex]
For calculating molar mass of any gas:
M= Density X (RT ÷ P)
M= 0.714 g X ([tex]8.314 J mol^{-1}K^{-1}[/tex]273 K ÷ 101325 Pa)
M= 15.994 g/mol = 16 g/mol.
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Using the information in the table to the right, calculate the enthalpy of combustion of 1 mole of acetylene for the reaction
The enthalpy of combustion of 1 mole of acetylene for the reaction using the information in the table (attached as figure) is - 1,256 kJ/mol
What is Enthalpy of combustion ?The enthalpy of combustion of a substance is defined as the heat energy given out when one mole of a substance burns completely in oxygen.
Hence, The enthalpy of combustion of 1 mole of acetylene for the reaction using the information in the table is - 1,256 kJ/mol
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When a magnet spins within a coil of wires, what is produced?
A. blue sparks
B. glowing light
C. nuclear energy
D. an electric current
and
In an electric generator, ___ will increase the output of electricity.
A. decreasing the turns of wire
B. increasing the turns of wire
C. decreasing the size of the magnet
D. decreasing the speed if the spinning magnet
lastly
Electric field defined as force per charge. It is measured in units of newtons divided by _____.
A. watts
B. coulombs
C. mass
D. grams
thanks :)
PLEASE answer ASP.
How is the strength of an electrostatic force determined?
Answer:
Explanation:The ratio of Coulomb force to gravitational force for an electron and a proton is given as,
r
1
=
R
2
Gm
1
m
2
4πε
0
1
×
R
2
q
1
q
2
=
6.67×10
−11
×9.1×10
−31
×1.67×10
−27
9×10
9
×(1.6×10
−19
)×(1.6×10
−19
)
=
1
2.27×10
39
The ratio of Coulomb force to gravitational force for two protons is given as,
r
2
=
R
2
Gm
2
4πε
0
1
×
R
2
q
1
q
2
=
6.67×10
−11
×(1.67×10
−27
)
2
9×10
9
×(1.6×10
−19
)×(1.6×10
−19
)
=
1
1.24×10
36
(b)
The magnitude of Coulomb force between electron and proton is given as,
F=
4πε
0
1
×
R
2
q
1
q
2
=
(10
−10
)
2
9×10
9
×(1.6×10
−19
)×(1.6×10
−19
)
=2.304×10
−8
N
The acceleration of electron is given as,
a
1
=
m
1
F
=
9.1×10
−31
2.304×10
−8
=2.5×10
22
m/s
2
The acceleration of proton is given as,
a
2
=
m
2
F
=
1.67×10
−27
2.304×10
−8
=1.4×10
19
m/s
2
Select the correct answer from each drop-down menu. Complete the sentences to explain what’s happening at different portions of the heating curve. Particles of the substance have the most kinetic energy when the substance is . The part of the graph that represents where the substance has the least amount of potential energy is labeled
In the given heating curve, Particles of the substance have the most kinetic energy when the substance is (a) 1. A gas. The part of the graph that represents where the substance has the least amount of potential energy is labeled (b) 1. Solid.
What is Heating curve ?The heating curve is the relationship between the heating system supply temperature and the outside air temperature.
Gas molecules have the highest average velocities among the three states of matter so gas has the highest kinetic energy.
During freezing, a substance loses a lot of potential energy so solid has the least potential energy.
Hence, In the given heating curve, Particles of the substance have the most kinetic energy when the substance is (a) 1. A gas.
The part of the graph that represents where the substance has the least amount of potential energy is labeled (b) 1. Solid.
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If 2 moles of water decomposes, the products that will form are 2 moles of hydrogen gas and one mole of oxygen gas. If a reaction is conducted that consumes 20.0 mL of water, what volume of oxygen gas will be produced
Answer:
Explanation:
The balanced equation for the decomposition of water is:
2H2O = 2H2 + 1O2
This tells us that we should expect 1 mole of O2 for every 2 moles of H2O, a molar ratio of (1 O2/2 H2O).
If we start with 2 moles of water, we should get (2mole H2O)*(1 O2/2 H2O) = 1 mole of H2.
But we are given just 20ml of water by the stingy boss. We need to calculate the number of moles of water in that 20 ml. We'll assume pure water at room temperature, so density = 1g/ml. We have 20 g of H2O. To find moles, divide by water's molar mass of 18 g/mole:
20g/(18g/mole) = 1.11 moles H2O
The moles of H2 produced would be:
(1.11 moles H2O)*(1 O2/2 H2O) = 0.55 moles O2 produced
We are not given the conditions of temperature and pressure, so the only way the calculate a volume of gas occupied by 1 mole of oxygen is to assume standard temperature and pressure (STP). At STP 1 mole of gas occupies 22.4 liters.
1 mole of O2 will be 22.4 liters.
0.55 moles of O2 would be:
(0.55 mole O2)*(22.4 liters) = 12.32 liters
How many moles of na2so4 are present in 284.078 grams of na2so4?
a. 2
b. 3
c. 5
d. 6
In What season of Breaking Bad did the character Walter White die.
Answer:
Season 5 lol
Explanation:
Answer:
season 1
Explanation:
the man was shot rip
Which question cannot be answered through scientific inquiry?
OA. Do people with more spare time live longer than those with less
spare time?
OB. Are people happier if they have more spare time?
OC. What is the relationship between how long a person lives and how
many hours per week they work?
OD. How does the number of hours worked per week affect a person's
health?
SABMIT
Answer: Are people happier if they have more spare time?
Explanation:
Happiness cannot be measured quantitatively.
Name 20 chemical changes in our daily environment
Answer:
chemical reactions In our daily environment are
1) Cooking food
2) Photosynthesis
3) rusting
4) painting
5) respiration
6) combustion
7) Electrochemistry (including chemical batteries)
8)Digestion
9)Soap and detergent reactions
10)Acid-base reactions
11) fermentation
12) oxidation
13 ) burning of paper
14) riping of fruits
15) frying egg
16) souring of milk
17) baking
18) heating sugar
19) burning wood
20) rising bread
Explain why beryllium looses electrons while ionic bonds,while Sulfur gains electrons.
Answer:
Since Beryllium has a larger atomic radius than Sulphur its electrons are not strongly attracted to the nucleus hence lost easily. But Sulphur has a small atomic radius hence electrons are more closely attracted to the nucleus.
blocks on the periodic table will not list a(n):
Blocks on the periodic table will not list a mass number of elements in this scenario.
What is Periodic table?This table comprises of elements in order of their atomic number which determines their chemical properties.
It contains the atomic number but however doesn't contain the mass number of the elements.
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Liquid tetrabromoethane has a density of 2.96 g/mL. A barometer is constructed using tetrabromoethane instead of mercury. If the atmospheric pressure is 0.971 atm, what is the height of the tetrabromoethane column in the barometer in cm
16.06 cm is the height of the tetra bromoethane column in the barometer in cm.
What is barometer?A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.
Explanation:
Pressure of the liquid column=ρgh
ρ= density of the liquid
h= height of the column
g= due to gravity
the
height of the mercury column corresponding to 0.971 atm
= 0.951×76÷1atm = 73.796 cm
[tex]\rho_1h_1g=\rho_2h_2g[/tex]
2.96 g/mL x 73.796 cm =13.6 g/mL [tex]h_2[/tex]
[tex]h_2[/tex]=16.06148235 =16.06 cm
16.06 cm is the height of the tetra bromoethane column in the barometer in cm.
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What makes a compound an acid?
a. It dissolves into Hydrogen ions in water (H+ and H3O+)
b. It has a pH higher than 7
c. It dissolves into Hydroxide ions in water (OH-)
d. It cannot be mixed with oil
Perform the following operation
and express the answer in
scientific notation.
2.36×10-2 8.4×10²
[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]
[tex]\qquad \tt \rightarrow \:2.8 × {10}^{-5}[/tex]
____________________________________
[tex] \large \tt Solution \: : [/tex]
[tex]\qquad \tt \rightarrow \: \dfrac{2.36 \times 10 {}^{ - 2} }{8.4 \times {10}^{2} } [/tex]
[tex]\qquad \tt \rightarrow \: \dfrac{2.36 }{8.4 } \times \cfrac{10 {}^{ - 2} }{10 {}^{2} } [/tex]
[tex]\qquad \tt \rightarrow \: 0.28 \times 10 {}^{ - 2 - 2} [/tex]
[tex]\qquad \tt \rightarrow \: 0.28 \times 10 {}^{ - 4} [/tex]
[tex]\qquad \tt \rightarrow \: 2.8 \times 10 {}^{ - 5} [/tex]
Answered by : ❝ AǫᴜᴀWɪᴢ ❞
What is the chsrge of am atom with an equal number of protons and electrons
Answer:
0
Explanation:
they cancel each other out (ex: 1 positive and 1 negative cancels, making it neutral or a charge of 0)
How many grams Fe2O3 would be
required to make 187 g Fe?
Fe₂O3 + 3CO →2Fe + 3CO2
267.14 gm grams[tex]Fe_2O_3[/tex] would be required to make 187 g Fe.
What is a balanced chemical equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.
The balanced equation:
Fe₂O₃ + 3 CO ⟶ 3 CO₂ + 2 Fe
We know that the molecular mass of iron-oxide = 160 g/mole.
We know that the molecular mass of iron = 56 g/mole.
From the above reaction, we can say that
1 mole of iron -oxide produces 2 moles of iron
160 gm of iron oxide produce 112 gm of iron
So,
1 gm of iron required 160÷112 =1.42 gram of iron oxide
Therefore,
187 gm of iron required 1.42 x 187 =265.54 of iron oxide.
Therefore 187 gm of iron required 267.14 iron oxide.
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What does the author predict about the future of the Earth's mantle? Do you support his educated guess? Use complete sentences to answer.
The earth's mantle will not change in the future because this region is safe from the intervention of human beings.
What happens in the Earth's mantle?The transfer of heat and material in the mantle helps us to determine the landscape of Earth. Activity in the mantle moves the plate tectonics, that contributes to volcanoes, seafloor spreading, earthquakes, and building of mountains.
So we can conclude that the earth's mantle will not change in the future because this region is safe from the intervention of human beings.
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A sample of carbon dioxide gas occupies a volume of 250 mL at 25c what volume will it occupy at 95c
Considering the Charles's law, the sample of carbon dioxide gas will occupy 308.72 mL.
Charles's lawCharles's law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law says that the volume is directly proportional to the temperature of the gas: for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases.
Mathematically, Charles's law states that the ratio between volume and temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Considering an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
Final volume in this caseIn this case, you know:
V1= 250 mLT1= 25 C= 298 K (being 0 C=273 K)V2= ?T2= 95 C= 368 KReplacing in Charles's law:
[tex]\frac{250 mL}{298 K} =\frac{V2}{368 K}[/tex]
Solving:
[tex]V2=368 K\frac{250 mL}{298 K}[/tex]
V2= 308.72 mL
Finally, the sample of carbon dioxide gas will occupy 308.72 mL.
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Answer:
310mL
Explanation:
A sample of carbon dioxide gas occupies a volume of 250 mL at 25°C. What volume will it occupy at 95°C?
Use the formula:
V1
T1
=
V2
T2
Temperature conversion: __°C + 273 K
this question in the screenshot
Mass of hydrate + crucible = 47.29 g
Mass of anhydrous salt = 2.7 g
Molar mass of anhydrous salt CuSO4 = 159.5 g
Given,
mass of empty crucible = 42.45 g
mass of hydrate salt= 4.84 g
mass of crucible after first heating = 46.1 g
mass of crucible after second heating= 45.153 g
mass of crucible after third heating= 45.15 g
so, as per the question we need to find...
Mass of hydrate + crucible = ? g
Mass of anhydrous salt = ? g
Molar mass of anhydrous salt CuSO4 = ? g
∴Mass of hydrate + crucible = 42.45 + 4.48 = 47.29 g
The given salt is in hydrate form, to remove water from this molecule we need to perform heating .
So we are taking the substance into the crucible as it is in less quantity.
Here, we performed heating 3 times and note the weight after every heating.
After this, assume that the water is totally evaporated and the remaining salt is in anhydrous form,
∴ Mass of anhydrous salt = 45.15 - 42.45 = 2.7 g
To find the molar mass of anhydrous salt of CuSO4,
atomic weight of Cu = 63.5 g
atomic weight of S = 32 g
atomic weight of O =16 g
∴ molar mass of anhydrous salt of CuSO4 = 63.5 + 32 + (16 ×3)
=159.5 gm
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There are 4.9875 mol C, 7.9802 mol H,
and 2.00 mol O in the sample.
Divide each by the smallest number of
moles. What is the ratio for the H?
did anyone able to look up this question
the ratio for the H is 3.9901
Natural gas (CH4) has a molar mass of 16.0 g/mole. You started out the day with a tank containing 200.0 g of natural gas. At the end of the day, your tank contains 30.0 g of natural gas. How many moles of gas did you use
Considering the definition of molar mass, the moles of gas used are 10.625 moles.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Amount of moles usedNatural gas has a molar mass of 16.0 g/mole.
You started out the day with a tank containing 200.0 g of natural gas. So, you can apply the following rule of three: If by definition of molar mass 16 grams are contained in 1 mole, 200 grams are contained in how many moles?
[tex]amount of moles at the beginning=\frac{200 gramsx1 mole}{16 grams}[/tex]
amount of moles at the beginning= 12.5 moles
At the end of the day, your tank contains 30.0 g of natural gas. So, you can apply the following rule of three: If by definition of molar mass 16 grams are contained in 1 mole, 30 grams are contained in how many moles?
[tex]amount of moles at the end=\frac{30 gramsx1 mole}{16 grams}[/tex]
amount of moles at the end= 1.875 moles
The number of moles used will be the difference between the number of moles used initially and the contents at the end of the day.
moles used= amount of moles at the beginning - amount of moles at the end
moles used= 12.5 moles - 1.875 moles
moles used= 10.625 moles
Finally, the moles of gas used are 10.625 moles.
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what are the most abundant metal in the earths crust from 1 to 10
Answer:
1. Oxygen - 46.1%
2. Silicon - 28.2%
3. Aluminium - 8.23%
4. Iron - 5.63%
5. Calcium - 4.15%
6. Sodium - 2.36%
7. Magnesium - 2.33%
8. Potassium - 2.09%
9. Titanium - 0.565%
10.Hydrogen -0.140%
Explanation:
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What type of molecule is shown below
Answer:
alcohol
Explanation:
alcohol thus, C2H5OH
How many moles of plutonium
are present in a sample
containing 8.4 x 1022 atoms of Pt?
?] moles Pt
0.139 moles of plutonium are present in a sample containing 8.4 x 10²² atoms of Pt.
How to calculate number of moles?The number of moles of a substance can be calculated using the following expression:
no of moles = no of molecules ÷ 6.02 × 10²³
According to this question, 8.4 × 10²² atoms of plutonium are present in the molecule of plutonium.
no of moles = 8.4 × 10²² = 6.02 × 10²³
no of moles = 1.39 × 10-¹
no of moles = 0.139moles
Therefore, 0.139 moles of plutonium are present in a sample containing 8.4 x 10²² atoms of Pt.
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A student was given a mixture of iron of iron fillings and sulphur. He was told to heat it and observe the compound.
(a) What is coloured formed.
(b) Write the effect of magnet on it.
(c) Write the action of carbon disulphide on it.
(d) Describe the effect of adding dilute hydrochloric acid to it. ldentify the gas and write its two properties.
Answer:
a) Black
b) Non-magnetic
c) No reaction with carbon disulphide.
d) i don't know sry
But i had to go through my 6th grade notes for this .____.
What is Mg ^-2 and SO4^-2=
MgSo4 will be formed
How many grams of oxygen gas (02) are needed to completely react with 9.30 moles
of aluminum?
4A1+302 → 2Al2O3
9.30 mol Al
3 mol O₂
4 mol Al
32.0 g 0₂
1 mol O₂
[?] g 0₂
Answer:
223 g O₂
Explanation:
To find the mass of oxygen gas needed, you need to (1) convert moles Al to moles O₂ (via the mole-to-mole ratio from reaction coefficients) and then (2) convert moles O₂ to grams O₂ (via the molar mass). When writing your ratios/conversions, the desired unit should be in the numerator in order to allow for the cancellation of the previous unit. The final answer should have 3 sig figs because the given value (9.30 moles) has 3 sig figs.
4 Al + 3 O₂ ----> 2 Al₂O₃
^ ^
Molar Mass (O₂): 32.0 g/mol
9.3 moles Al 3 moles O₂ 32.0 g
------------------- x --------------------- x -------------------- = 223 g O₂
4 moles Al 1 mole
