Answer:
There are [tex]1.323\times 10^{31} atoms[/tex] of mercury in 4,408 metric tons.
Explanation:
Mass of mercury metal = 4,408 metric ton
1 metric ton = 1000 kg
4,408 metric ton = 4,408 × 1000 kg = 4,408,000 kg
1 kg = 1000 g
4,408,000 kg = 4,408,000 × 1000 g = 4,408,000,000 g
[tex] 4,408,000,000 g=4.408\times 10^9 g[/tex]
Mass of mercury = [tex]4.408\times 10^9 g[/tex]
Atomic mass of mercury = 200.59 g/mol
Moles of mercury = n
[tex]n=\frac{4.408\times 10^9 g}{200.59 g/mol}[/tex]
[tex]1 mole=N_A=6.022\times 10^{23}[/tex] atoms/molecules/ ions
Number of atoms of mercury in n moles = N
[tex]N=n\times N_A[/tex]
[tex]N=\frac{4.408\times 10^9 g}{200.59 g/mol}\times 6.022\times 10^{23}\\=1.323\times 10^{31} atoms[/tex]
Hence, there are [tex]1.323\times 10^{31} atoms[/tex] of mercury in 4,408 metric tons.
Calculate the molar solubility of CaF2 in a 0.25 m solution of NaF(aq).
(Ksp (CaF2) = 4.0 x 10-11)
Answer:
6.4 × 10^-10 M
Explanation:
The molar solubility of the ions in a compound can be calculated from the Ksp (solubility constant).
CaF2 will dissociate as follows:
CaF2 ⇌Ca2+ + 2F-
1 mole of Calcium ion (x)
2 moles of fluorine ion (2x)
NaF will also dissociate as follows:
NaF ⇌ Na+ + F-
Where Na+ = 0.25M
F- = 0.25M
The total concentration of fluoride ion in the solution is (2x + 0.25M), however, due to common ion effect i.e. 2x<0.25, 2x can be neglected. This means that concentration of fluoride ion will be 0.25M
Ksp = {Ca2+}{F-}^2
Ksp = {x}{0.25}^2
4.0 × 10^-11 = 0.25^2 × x
4.0 × 10^-11 = 0.0625x
x = 4.0 × 10^-11 ÷ 6.25 × 10^-2
x = 4/6.25 × 10^ (-11+2)
x = 0.64 × 10^-9
x = 6.4 × 10^-10
Therefore, the molar solubility of CaF2 in NaF solution is 6.4 × 10^-10M
The molar solubility should be 6.4 × 10^-10 M
Calculation of the molar solubility:Here
CaF2 will dissociate should be
CaF2 ⇌Ca2+ + 2F-
where,
1 mole of Calcium ion (x)
2 moles of fluorine ion (2x)
Now
NaF will also dissociate like
NaF ⇌ Na+ + F-
Here
Na+ = 0.25M
F- = 0.25M
Now
Ksp = {Ca2+}{F-}^2
Ksp = {x}{0.25}^2
4.0 × 10^-11 = 0.25^2 × x
4.0 × 10^-11 = 0.0625x
x = 4.0 × 10^-11 ÷ 6.25 × 10^-2
x = 4/6.25 × 10^ (-11+2)
x = 0.64 × 10^-9
x = 6.4 × 10^-10
Therefore, the molar solubility of CaF2 in NaF solution is 6.4 × 10^-10M
Learn more about solution here: https://brainly.com/question/14619461
What is the period number in which helium is found
Answer:
Helium is the second element on the periodic table. It is located in period 1 and group 18 or 8A on the righthand side of the table. This group contains the noble gases, which are the most chemically inert elements on the periodic table. Each He atom has two protons and usually two neutrons and two electrons.
Explanation:
thoughtco.com
Answer:
period 1 and group 18 or 8A on the righthand side of the table.
Explanation:
What is the difference between dehydration and hydrolysis?
Answer:
Some differences between the given particular topics are described below.
Explanation:
Hydrolysis occurs as the water is absorbed in some kind of a response to breaking up the polymer through its corresponding monomers while Dehydration synthesis happens whenever water has been formed as a formation of the polymerization of the latter's corresponding monomers.Hydrolysis seems to be a method during which a chemical bond becomes dissolved by a water molecule while Dehydration would be a state of consuming less liquid than that of the natural rate.Several properties of the element magnesium are shown. Which one is a chemical property?
O A. has a density of 1.7 g/cm3
B. melts at 650°C
C. conducts electricity
D. has a silvery-white color
E. burns when exposed to heat
Answer:
E
Explanation:
burning a substance changes it chemically.
In what two ways can an object possess energy?
Explanation:
An object can possess energy in tow ways by it's motion or position
which are made matters
Answer:
Everything you can hold, taste, or smell is made of matter. Matter makes up everything you can see, including clothes, water, food, plants, and animals. It even makes up some things you cannot see, such as air or the smell of perfume.
What are the effects of inhalation of acetone vapor?
Answer:
it can cause irritation in eyes throat and lungs and u can become lightheaded, or possibly fall in a coma
how are the troposphere and the thermosphere alike
Multiply 17.243 × 0.95 = _____
Answer:16.38085
Explanation:Aline the decimals then start multiplying.
17. SiH3P
How do you create a Lewis structure for this formula?
Answer:
See attached picture.
Explanation:
Hello,
In this case, considering that Lewis structures are drawn in order to show up the bonding among equal or different atoms via their valence electrons, since hydrogen has one valence electron, silicon four and phosphorous five, the most suitable way to draw and attain the octet for both silicon and phosphorous is by bonding them via a double bond, one hydrogen bonded to the phosphorous and two hydrogen atoms bonded to the silicon as shown on the attached picture, wherein you can count eight electrons for both phosphorous and silicon.
Best regards.
Calculate the [H+] and pH of a 0.000185 M acetic acid solution. Keep in mind that the Ka of acetic acid is 1.76×10−5. This is a problem that will require you to use the quadratic. Start by setting up the quadratic equation before using the quadratic formula and find the coefficients. Then, solve the quadratic. Quadratic formula: ax2+bx+c=0; enter the values of a, b, and c
Answer:
[H⁺] = 0.000048936M
pH = 4.31
Explanation:
Acetic acid, CH₃COOH, dissociates in water as follows:
CH₃COOH(aq) ⇄ H⁺(aq) + CH₃COO⁻(aq)
And Ka is defined as:
Ka = 1.76x10⁻⁵ = [H⁺] [CH₃COO⁻] / [CH₃COOH]
Where [] are equilibrium concentrations of the species.
The 0.000185M of acetic acid will decreases X, and X of [H⁺] and [CH₃COO⁻] will be produced. That means Ka is:
1.76x10⁻⁵ = [X] [X] / [0.000185 - X]
3.256x10⁻⁹ - 1.76x10⁻⁵X = X²
3.256x10⁻⁹ - 1.76x10⁻⁵X - X² = 0
Solving for X:
X = -0.000066M → False solution. There is no negative concentrations.
X = 0.000048936
As [H⁺] = X,
[H⁺] = 0.000048936M
And pH = -log [H⁺]
pH = 4.31What is the potential energy of the ball when it gets to its maximum height just before falling back to the ground?J
Answer:
9.8 joules
Explanation:
due to acceleration due to gravity
Write the net ionic equation for the reaction that takes places between aqueous copper and nitrate.
Answer:
Cu+HNO3
Explanation:
The reason a theory may be changed or thrown out is
Answer:
If it is not proven and if it isn't backed up by any facts or has been proven to be false.
Which is more dense? A foam ball or a bowling ball?
Please help! Only answer if you know the answer 100%
Liquids that do not mix can be separated by which technique
A) Filtration
B) Distillation
C) Decantation
D) Evaporation
Two separate pure samples of carbon dioxide were analyzed. Both samples were found to contain 27.29% carbon by mass. Justify these findings on the basis of atomic molecular theory.
Answer:
Atoms of the same element are exactly alike in all respects and are different from atoms of other elements.
Explanation:
One of the postulates of the Dalton's atomic theory is that 'Atoms of the same element are exactly alike in all respects and are different from atoms of other elements.'
Hence, if carbon dioxide from two sources are obtained and analysed, the mass percentage of carbon in both samples should be exactly the same since they both contain atoms of carbon. The atoms of carbon in the both samples are exactly the same in all respects in accordance with the Dalton's atomic theory, hence the observation.
Calculate the [OH-] and the pH for a solution of 0.24M methylamine, CH3NH2. Kb = 3.7 X 10-4.
Answer:
[tex][OH^-]=9.24x10^{-3}M[/tex].
[tex]pH=11.97[/tex].
Explanation:
Hello,
In this case, since the ionization of methylamine is:
[tex]CH_3NH_2(aq)+H_2O(l)\rightleftharpoons CH_3NH_3^+(aq)+OH^-(aq)[/tex]
The equilibrium expression is:
[tex]Kb=\frac{[CH_3NH_3^+][OH^-]}{[CH_3NH_2]}[/tex]
And in terms of the reaction extent [tex]x[/tex] which is equal to the concentration of OH⁻ as well as that of CH₃NH₃⁺ via ice procedure we can write:
[tex]3.7x10^{-4}=\frac{x*x}{024-x}[/tex]
Whose solution for [tex]x[/tex] via quadratic equation is 9.24x10⁻³ M since the other solution is negative so it is avoided. Therefore, the concentration of OH⁻ is:
[tex][OH^-]=x=9.24x10^{-3}M[/tex]
With which we can compute the pOH at first:
[tex]pOH=-log([OH^-])=-log(9.24x10^{-3})=2.034[/tex]
Then, since pH and pOH are related via:
[tex]pH+pOH=14[/tex]
The pH turns out:
[tex]pH=14-pOH=14-2.034\\\\pH=11.97[/tex]
Best regards.
Which of the following describes the formation of an ionic bond
Explanation:
loosing or gaining one or more electrons
Determine the partial negative charge on the bromine atom in a c−br bond. the bond length is 1.93 å and the bond dipole moment is 1.40 d . express your answer using 3 significant figures. the partial negative charge on the bromine atom = previous answersrequest answer incorrect; try again; 4 attempts remaining provide feedback.
Answer:
The value is [tex]x = 0.151 \ e [/tex]
Explanation:
From the question we are told that
The bond length is [tex]l = 1.93\ \r a = 1.93 *1 *10^{-10} =1.93 *10^{-10}\ m [/tex]
The bond dipole moment is [tex] \mu = 1.40 d = 1.40 * 3.33564 *10^{-30} = 4.6699 *10^{-30} \ C \cdot m[/tex]
Generally the dipole moment is mathematically represented as
[tex]\mu = Q * l[/tex]
Here Q is the partial negative charge on the bromine atom
So
[tex]Q = \frac{\mu}{ l}[/tex]
=> [tex]Q = \frac{4.6699 *10^{-30}}{ 1.93 *10^{-10} }[/tex]
=> [tex]Q = 2.42 *10^{-20} C [/tex]
Generally
1 electronic charge(e) is equivalent to [tex]1.60*10^{-19} C[/tex]
So x electronic charge(e) is equivalent to [tex]Q = 2.42 *10^{-20} C [/tex]
=> [tex]x = \frac{2.42 *10^{-20}}{1.60*10^{-19} }[/tex]
=> [tex]x = 0.151 \ e [/tex]
5.05 g
Express your answer as an integer.
Answer:5.5
Explanation:
A gas cylinder is filled with silane (SiH4), used in semiconductor processes. The cylinder’s internal volume is 2.40 L, and it contains 542 g of the compound. Estimate the pressure inside the cylinder at 21oC. The properties of silane: Tc = 269.7 K, Pc = 48.4 bar, and ω = 0.094.
Answer:
The value is [tex]P = 7.8 *10^{6} \ Pa [/tex]
Explanation:
From the question we are told that
The internal volume is [tex]V_i = 2.40 \ L = 2.40 *10^{-3} \ m^3[/tex]
The mass of the compound contained is [tex]m = 542 \ g[/tex]
The temperature is [tex]T = 21^o C = 21 + 273 = 294 \ K[/tex]
The critical temperature of silane is [tex]T_c = 269.7 \ K[/tex]
The critical pressure of silane is [tex]P_c = 48.4 bar = 48.4 *10^{5} \ Pa[/tex]
Generally the number of moles of silane inside the cylinder is mathematically represented as
[tex]n = \frac{m}{M}[/tex]
here M is the molar mass of silane with value [tex]M = 32 g/mol[/tex]
So
[tex]n = \frac{542}{32}[/tex]
=> [tex]n = 16.4 \ mol[/tex]
Generally the molar volume of silane in the cylinder is mathematically represented as
[tex]Vn = \frac{V_i}{n}[/tex]
=> [tex]Vn = \frac{2.40 *10^{-3}}{16.4}[/tex]
=> [tex]Vn = 1.42*10^{-4} \ m^3 / mol[/tex]
Generally from Soave-Redlich-Kwon we have that
[tex]P = \frac{RT}{V_n - b} - \frac{a}{V_n (V_n + b)}[/tex]
Here b is a constant which is mathematically represented as
[tex]b = 0.08664 * \frac{R T_c }{P_c}[/tex]
substituting [tex]8.314 J/mol\cdot K[/tex] for R we have \
[tex]b = 0.08664 * \frac {8.314* 269.7}{48.4*10^{5}}[/tex]
[tex]b = 4.0139 *10^{-5} m^3/mol[/tex]
a is also a constant which is mathematically represented as
[tex]a = 0.42748 * \frac{(R * T_c)^2}{P_c} * (1 + m [1-\sqrt{T_r} ])^2[/tex]
Here [tex]T_r[/tex] is the reduced temperature which is mathematically represented as
[tex]T_r = \frac{T}{T_c}[/tex]
=> [tex]T_r = 1.09[/tex]
m is a constant which is mathematically represented as
[tex]m = 0.480 + 1.574w - 0.176w^2[/tex]
=> [tex]m = 0.480 + 1.574 (0.094) - 0.176(0.094)^2[/tex]
=> [tex]m = 0.626[/tex]
So
[tex]a = 0.42748 * \frac{(8.314 * 269.7)^2}{48.4*10^{5}} * (1 + 0.626 [1-\sqrt{1.09} ])^2[/tex]
[tex]a = 0.4198[/tex]
From [tex]P = \frac{RT}{V_n - b} - \frac{a}{V_n (V_n + b)}[/tex] we have
[tex]P = \frac{8.314 * 294}{1.42*10^{-4} - 4.0139 *10^{-5} } - \frac{0.626}{1.42*10^{-4} (1.42*10^{-4} + 4.0139 *10^{-5} )}[/tex]
[tex]P = 7.8 *10^{6} \ Pa [/tex]
Suppose that 10.0 mol C2H6(g) is confined to 4.860 dm3 at 27 °C. Predict the pressure exerted by the ethane from (i) the perfect gas and (ii) the van der Waals equations of state. Calculate the compression factor based on these calculations. For ethane, a = 5.507 dm6 atm mol−2, b = 0.0651 dm3 mol−1.
Answer:
[tex]P=35.16[/tex]
[tex]Z=4.6[/tex]
Explanation:
Hello,
In this case, since the VdW equation is:
[tex]P=\frac{nRT}{V-n*b}-a(\frac{n}{V} )^2[/tex]
Since the moles are 10.0 moles, the temperature in K is 300.15 K and the volume is liters is also 4.860 L (1 dm³= 1L), the pressure exerted by the ethane is:
[tex]P=\frac{10.0mol*0.082\frac{atm*L}{mol*K}*300.15K}{4.860mol-10.0mol*0.0651\frac{L}{mol} }-5.507\frac{atm*L^2}{mol^2}(\frac{10.0mol}{4.86L} )^2\\\\P=58.48atm-23.3atm\\\\P=35.16[/tex]
Thus the compression factor turns out:
[tex]Z=\frac{PV}{RT}=\frac{23.3atm*4.86L}{ 0.082\frac{atm*L}{mol*K}*300.15K}\\\\Z=4.6[/tex]
Regards.
A compound is found to contain 46.68 % nitrogen and 53.32 % oxygen by mass. To answer the question, enter the elements in the order presented above. QUESTION 1: The empirical formula for this compound is . QUESTION 2: The molar mass for this compound is 30.01 g/mol. The molecular formula for this compound is
Answer:
Q1: NO
Q2: NO
Explanation:
Step 1: Given data
Percentage by mass of nitrogen: 46.68%
Percentage by mass of oxygen: 53.32%
Step 2: Divide each percentage by the mass of the element
N: 46.68/14.01 = 3.332
O: 53.32/16.00 = 3.332
Step 3: Divide both numbers by the smallest one (in this case is the same)
N: 3.332/3.332 = 1
O: 3.332/3.332 = 1
The empirical formula is NO. Its molar mass is 30.01 g/mol.
Step 4: Calculate "n"
n = molar mass of the molecular formula / molar mass of the empirical formula
n = (30.01 g/mol) / (30.01 g/mol) = 1
Step 5: Determine the molecular formula
We do so by multiplying the empirical formula by "n".
NO × 1 = NO
A plate moves 200 m in 10,000 years. What is its rate in cm/year?
Answer:
The answer is
2 cm/yearExplanation:
To find the rate in cm/year we must first convert 200 m into cm
1 m = 100 cm
if 1 m = 100 cm
Then 200 m = 200 × 100 = 20 ,000 cm
So the rate is
[tex] \frac{20000}{10000} [/tex]Reduce the fraction with 10,000
We have the final answer as
2 cm/yearHope this helps you
Answer:
2 CM/year just now got 100 Edge.
Explanation:
Glassblower creating sculptures out of glass physical or chemical
Answer:
phsical
Explanation:
it is a phisical cuz your only changing the shape not the chemical structure
a non-aqueous solution has a solvent that is not water. which is an example of a non aqueous solution?
paint
steel
orange juice
shaving cream
i’m confused because normally paint would be classified as a heterogenous mixture (not a solution) but the only other logical answer is orange juice but that is aqueous since it’s a solution based off the natural waters found in the orange. :/
Answer:
It is B. Steel
Explanation:
Answer:
Defenitly B !!
( Steel )
Explanation:
(3.605 X 10^-27) + (4.01 X 10^-25)
Answer in scientific notation
A sample of water is measured with a 2 mL volumetric pipet. What volume
measurement should be recorded with the correct number of decimal places?
Answer:
Explanation:
A pipette is used to measure an exact volume of liquid; a pipette can only measure it's exact recommended volume (it can't measure more or less).
Hence, a 2-mL volumetric pipette can only measure 2 ml and would be recorded as 2.00 (ml). This is because simple volumes are usually recorded in two decimal places.
Explain why or why not it’s necessary for the scientific process to always follow the same route
Answer:
Explanation:
The scientific method describes the processes by which scientists gain knowledge about the world. It's characterized by six key elements: questions, hypotheses, experiments, observations, analyses, and conclusions. These elements are interrelated steps, so they don't always function in the same order.
