Answer:
.133
Explanation:
Dissolution of solute lowers the vapor pressure of solvent .
Relative lowering by non -volatile solute is equal to mole fraction of solute dissolved .
Vapor pressure of pure water is 2.33 k Pa
Lowering of vapor pressure = 2.33 - 2.02 = .31 k Pa .
relative lowering = .31 / 2.33 = .133
relative lowering will be equal to mole fraction of non volatile solute like NaCl
so mole fraction of NaCl dissolved = .133
what volume of 7.25 mol/L stock solution in needed to make 3.84 L of 8.50 mol/L solution?
Answer:
4.50 L
Explanation:
First we calculate how many moles are there in 3.84 L of a 8.50 mol/L solution:
3.84 L * 8.50 mol/L = 32.64 molNow, keeping in mind that
Concentration = Mol / Volumewe can calculate the volume of a 7.25 mol/L solution that would contain 32.64 moles:
Volume = Mol / ConcentrationVolume = 32.64 mol ÷ 7.25 mol/LVolume = 4.50 LSo we could take 4.50 L of the 7.25 mol/L solution and evaporate the solvent until only 3.84 L remain.
5 Cu3(PO4)2
Which of the following is the coefficient?
Answers:
A.) 5
B.) 3
how do I connect a nuclear transfer pipe to an energy condenser that is connected to a tessoract?
Answer:
Yes You use the nuclear transfuser to do that
Explanation:
Answer:
tessoract? also why did you stael my name?
Explanation:
Imagine you leave a bottle of something toxic to humans open overnight in a sealed laboratory.
The levels of solution drastically drop, and you do not know if it is harmful or not with your
knowledge of the ideal gas law, explain how you can determine whether it is safe or not in the
laboratory Use a simple experimental setup to support your argument
Answer:
Argument: It is not Safe
Further support to the argument is given below.
Explanation:
Solution:
Argument: It is not Safe
First of all, we all know the ideal gas law:
PV = nRT
And the Boyle's Law states that , if the pressure is increased then, volume will decrease. and if the volume is increased then pressure will decrease.
V is inversely proportional to Pressure of the gas.
So, in this case, Let's suppose we have toxic solution of methyl alcohol in the bottle which is tightly closed. It means pressure in the bottle is high, hence the volume is less.
If in this scenario someone, leave the bottle open in the laboratory and as it is given that the level of solution will drastically decrease. It means it is volatile in nature and is converted into gaseous form and we know now that the open bottle has now less pressure. Hence the volume of the gas will be higher and now it can spread to every corner of the laboratory. And it is very dangerous.
PLEASE HELP I WILL MARK BRAINLIEST!!!
Reactions In Our World Lab Report
Reactions in our natural world range from classical chemical reactions to nuclear reactions.
What is a chemical reaction?A classical chemical reaction is a natural process that occur when one or more elements called reactants change to form one or more products.
Chemical reactions can be speed up by the action of enzymes, which are biological catalysts capable of lowering the activation energy of the reactions.
On the other hand, nuclear reactions occur when atoms react among them to generate new elements.
Nuclear reactions can be classified into fusion reactions where atomic nuclei fuse and fusion reactions where an atomic nucleus gives rise to two different atoms.
In conclusion, Reactions in our natural world range from classical chemical reactions to nuclear reactions.
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What is the local, day-by-day changes in the atmoshpheres condition called? A. climate B. weather C. temperature D. precipitation
Answer:
B.
Explanation:
Weather changes daily and varies in different areas around the world
A(n) _______________ holds municipal solid waste, construction debris, and some types of agricultural and industrial waste.
Answer:
sanitary landfill
Explanation:
Calculate the mass of sodium bromide dihydrate is required to prepare 250 mL of a 0.00600 M solution
Answer: The mass of sodium bromide dihydrate is 0.208 grams
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml = 250 ml
moles of [tex]NaBr.2H_2O[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{xg}{138.92g/mol}[/tex]
Now put all the given values in the formula of molality, we get
[tex]0.00600=\frac{x\times 1000}{138.92\times 250}[/tex]
[tex]x=0.208[/tex]
Therefore, the mass of sodium bromide dihydrate is 0.208 grams
Imagine you have an object with a non-geometric shape having a mass of 26.7 g and
a density of 0.767 g/mL. If it were placed in a graduated cylinder containing 20.0 mL
of water what would you expect the new water level to read? [Assume the sample is
completely submerged and everything is done at 25°C]
Answer:
The new reading of the water level is 54.81 mL.
Explanation:
From the question given above, the following data were obtained:
Mass of object = 26.7 g
Density of object = 0.767 g/mL
Volume of water = 20 mL
New reading of the water level =?
Next, we shall determine the volume of the object. This can be obtained as follow:
Mass of object = 26.7 g
Density of object = 0.767 g/mL
Volume of object =?
Density = mass /volume
0.767 = 26.7 / volume of object
Cross multiply
0.767 × Volume of object = 26.7
Divide both side by 0.767
Volume of object = 26.7 / 0.767
Volume of object = 34.81 mL
Finally, we shall determine the new reading of the water level. This can be obtained as follow:
Volume of water = 20 mL
Volume of object = 34.81 mL
New reading of the water level =?
New reading of the water level = (Volume of water) + (Volume of object)
New reading = 20 + 34.81
New reading of the water level = 54.81 mL
A mixture of gases contains 4.46 moles of neon (Ne), 0.74 mole of argon (Ar), and 2.15 moles of xenon (Xe). Calculate the partial pressures of the gases if the total pressure is 2.00 atm at a certain temperature.
Explanation:
The partial pressure of an individual gas is equal to the total pressure of the mixture multiplied by the mole fraction of the gas.
Total pressure = 2atm
Mole Fraction = number of moles / total number of moles
Neon
Mole Fraction = 4.46 / 7.35 = 0.607
Partial Pressure = 0.607 * 2 = 1.214 atm
Argon
Mole Fraction = 0.74 / 7.35 = 0.101
Partial Pressure = 0.101 * 2 = 0.202 atm
Xenon
Mole Fraction = 2.15 / 7.35 = 0.293
Partial Pressure = 0.293 * 2 = 0.586 atm
How many electrons does an ion of magnesium have if it’s represented by the symbol shown below? 25Mg2+
Answer:
10 electrons.
Explanation:
Hello!
In this case, since a normal atom of magnesium has 12 protons and electrons when is not in the form of a cation, since it is a metal that tends to lose electrons when ionized, and therefore it becomes positively charged, we infer that in form of:
[tex]Mg^{2+}[/tex]
It only has 10 electrons.
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30 g of Magnesium and 30 g of Oxygen are reacted,
then the residual mixture contains
Answer:
2Mg + O2 -> 2MgO
Explanation:
According to the above reaction ,
28.6g(2mole) Mg combine with 32g (1mole) of O2 to give 80.6g (2 mole) of MgO.
thus,
30g Mg will combine with 20g of O2 to produce 50g MgO and 10gO2 will remain unreactive.
I hope it's helpful!
N2 reacts with hydrogen gas according to the following equation:
N2 + 3 H2 → 2 NH3
If 41.93 grams of N2 reacts, how many grams NH3 is produced?
Answer:
Mass = 51 g
Explanation:
Given data:
Mass of nitrogen = 41.93 g
Mass of ammonia formed = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Number of moles of nitrogen:
Number of moles = mass/molar mass
Number of moles = 41.93 g/ 28 g/mol
Number of moles = 1.5 mol
now we will compare the moles of nitrogen and ammonia.
N₂ : NH₃
1 : 2
1.5 : 2/1×1.5 = 3 mol
Mass of ammonia formed:
Mass = number of moles × molar mass
Mass = 3 mol × 17 g/mol
Mass = 51 g
A solution is made by mixing of chloroform and of heptane . Calculate the mole fraction of chloroform in this solution. Be sure your answer has the correct number of significant digits.
Answer:
0.53
Explanation:
A solution is made by mixing 42 g of chloroform (CHCl₃) and 31 g of heptane (C₇H₁₆). Calculate the mole fraction of chloroform in this solution. Be sure your answer has the correct number of significant digits.
Step 1: Calculate the number of moles of chloroform
The molar mass of CHCl₃ is 119.38 g/mol.
42 g × 1 mol/119.38 g = 0.35 mol
Step 2: Calculate the number of moles of heptane
The molar mass of C₇H₁₆ is 100.20 g/mol.
31 g × 1 mol/100.20 g = 0.31 mol
Step 3: Calculate the total number of moles
We will use the following expression.
n = nCHCl₃ + nC₇H₁₆ = 0.35 mol + 0.31 mol = 0.66 mol
Step 4: Calculate the mole fraction of chloroform
We will use the following expression.
χ(CHCl₃) = nCHCl₃ / n
χ(CHCl₃) = 0.35 mol / 0.66 mol = 0.53
A 45.0 g sample of a metal at 85.6 °C is placed in 150.0 g of water at 24.6 °C. The final temperature of the system is 28.3 °C. Calculate the specific heat of the metal.
Answer:
904.014 j/kgk
Explanation:
Mass of metal = 45g
Temperature of metal = 85.6°
Mass of water = 150
Temperature of water = 24.6
Final temperature of system = 28.3
Heat lost by metal = Heat gained by water
m1 * c1 * dt = m2 * c2 * dt
Q = quantity of heat
Q = m*c*dt
dt = change in temperature
dt of water = 28.3 - 24.6 = 3.7
dt of metal = 85.6 - 28.3 = 57.3
Specific heat capacity of water, c = 4200
(45 * 10^-3) * c * 57.3 = (150 * 10^-3) * 4200 * 3.7
2.5785c1 = 2331
c1 = 2331 / 2.5785
= 904.01396
= 904.014 j/kgk
Please help me fill in this answer........
I’ll mark brainliest
Help me please
:)
Answer:
the amount of atoms and particle I think is in here is 17 that oxygen and water can hold with the amount of barium hydrogen.
Which statement best describes a waxing gibbous moon?
The moon has moved past the new moon and is moving toward the first quarter.
The moon has moved past the first quarter and is moving toward the full moon.
The moon has moved past the third quarter and is moving toward the new moon.
The moon has moved past the full moon and is moving toward the third quarter.
the second option is best described
Explanation:
.
What is the volume of 0.4 moles carbon dioxide at STP?
Answer:
Hi I ll explain
Explanation:
[tex]0.4mol \times \frac{22.4liter}{1mol} = 8.96liter[/tex]
Remember
At STP always one mole of every gas equals 22.4 liter
6. A. If 4.50 mols of ethane, C2H6, undergoes combustion according to the unbalanced equation
C2H6 + O2 ----------> CO2 + H2O
how many moles of oxygen are required?
B. How many moles of each product are formed?
Answer:
for one mole of C2H6 there are 7/2 mole of O2 required. so for4. 50 moles you require 4.50 x 7/2 = 15.75 moles of O2.
Explanation:
i hope it's helpful
how many grams of carbon are in 12x10^23 atoms of carbon
Answer:23.9 g
Explanation:
Grams C = (12/6.02214076)*12 = 23.9 g
There are 23.9 grams of carbon are in [tex]12*10^{23}[/tex] atoms of carbon.
As we know that, atomic mass of carbon is 12.
It means that, In one mole of carbon , 12 grams of carbon is present.
1 mole [tex]=6.022*10^{23} atoms[/tex]
In [tex]6.022*10^{23}[/tex] atoms of carbon, 12 grams of carbon is present.
So, In [tex]12*10^{23}[/tex] atoms of carbon,
[tex]=\frac{12}{6.022*10^{23} }*6*10^{23}\\\\=23.9 grams[/tex]
There are 23.9 grams of carbon are in [tex]12*10^{23}[/tex] atoms of carbon.
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did the mixture boil faster
Answer:
no it will take more time to boil
How many electrons can fit in the second electron shell?
Question 3 options:
2
6
8
4
Answer:
C. 8
Explanation:
The second shell can hold a maximum of eight electrons. When this is filled, electrons go into the third shell, which also holds a maximum of eight electrons. Then the fourth shell begins to fill. A lithium atom, for example, has three electrons.
2. Using a heater to heat up your cold room is an example of...
Hot air
rises
Air cooled
by room
sinks
Gravity
furnace
Conduction
Convection
Radiation
Answer:
Convection. Happens when air surrounding the heater is heated
where do convection currents occur
Answer: Lava lamps, Earth's mantle, and the Earth's atmosphere.
Explanation: Convection occurs when denser elements sink while less dense elements rise due to difference in density caused by heat.
The wax in lava lamps rises when heated up since their density decreases. The same is for the Earth's mantle, where hotter materials rise, while the cooler ones sink.
Why does solid water (ice) float when placed in liquid water? *
Ice does not float in liquid water.
Ice is less dense than liquid water.
Ice is more dense than liquid water.
The densities of liquid water and ice are the same .
Answer:
Ice is less dense than water.
In a dilation what mathematical operation is used with the scale factor?
a
multiplication
b
addition
c
division
d
subtraction
Answer:a multiplication
Explanation:
In a dilation, multiplication is the mathematical operation which is used with the scale factor. Thus, the correct option is A.
What is dilation?Dilation is a process of changing the size or the shape of an object by decreasing or increasing its dimensions by some scaling factors.
In mathematics, dilation is a function (f) from a metric space (M) into itself which satisfies the identity (d=rd) for all points x, y \in M, where d is the distance from the points x to y and r is some positive real number. In this, the mathematical operation which is used is multiplication.
Therefore, the correct option is A.
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What is the atomic symbol for lead?
Answer:
Pb
Explanation:
Answer:
Pb is the answer You're looking for
Which finding would have disproved Virchow’s hypothesis?
a. Animalcules are not organisms.
b. Animals are made of non–cell-based matter.
c. Plants are made of non–cell-based matter.
d.Cells can generate from nonliving matter.
Answer:
DJSZJDSFRBGUEJD HVCX
Explanation:
Which structures allow communication between plant cells?
The cells in both plants are animals are connected together and communicate through some specified structures. In plants cells are connected by a tubular structure called plasmodesmata.
What are cells?Cells are the basic units of every lives. A cell contains a nucleus which is the center of a cell and regulates the overall functions of the cell. The cytoplasm of cells are connected for communication by some structure which are different for plants and animals.
In the case of plants, the cells junction or the structure which connects adjacent cell is called plasmodesmata which links the endoplasmic reticulum, cytoplasm and plasma membranes of the plant cells.
Through these microscopic channels transport of smaller ions and signals are passed to adjacent cells. A typical plant cell might have about 100000 plasmodesmata connecting the cells.
Plasmodesmata appears to be continuous extension of the cell membrane. Hence, the structures that allow communication between plant cells is Plasmodesmata.
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Which electron-dot structure represents a non-polar
molecule?
Answer:
CH4
Explanation:
It is a symmetrical molecule thus making it a non-polar molecule
