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3 years ago

How many oxygen atoms are in 1.00 g of quartz?

1 answer:

4 0

<span>2.00 x 10^22 atoms The empirical formula for quartz is SiO2, so calculate the molar mass of quartz. Silicon = 28.0855 Oxygen = 15.999 Molar mass = 28.0855 + 2 * 15.999 = 60.0835 Now divide the mass you have of quartz by its molar mass 1.00 g / 60.0835 g/mol = 0.016644 mol Since you have 2 moles of oxygen atoms per mole of quartz, multiply by 2 0.016644 mol * 2 = 0.033288 mol Finally, multiply by avogadro's number to get the number of atoms. 0.033288 mol * 6.0221409e+23 atoms/mol = 2.00465 x 10^22 Round to 3 significant figures to get 2.00 x 10^22</span>

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Is phosphorous dissolving in carbon disulfide a physical or chemical property? if physical, is it intensive or extensive?

Nana76 [90]

Answer: Phosphorus is insoluble in water, but soluble in carbon disulfide. Phosphorus burns spontaneously in air to its pentoxide.

Explanation: Hope this helped! :)

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4 years ago

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Why is helium nucleus containing no neutrons is likely to be unstable

jolli1 [7]

<span>A Helium nucleus is likely to be unstable if it has no neutrons because the remaining protons will repel electromagnetically and basically cause the atom to fall apart. The neutrons could have helped in holding everything together, and not make the protons repel.</span>

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4 years ago

PLEASE HELP. !!

scoray [572]

Answer:

Potential energy = 441 N

Explanation:

Given:

Mass M = 15 kg

Height = 3 m

Find:

Potential energy

Computation:

Potential energy = mgh

Potential energy = (15)(9.8)(3)

Potential energy = 441 N

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3 years ago

Select the answer which shows the correct order, slowest to fastest, of the relative rate of diffusion of the gases.

IrinaK [193]

Diffusion is the process of a substance spreading out to evenly fill its container or environment. Rate of diffusion of a gas is inversely proportional to the molar mass of the gas.

$Rate of diffusion \propto \frac{1}{Molar mass}$

Lighter(lower) the molar mass of the gas , faster will be its rate of diffusion and heavier (higher) the molar mass of the gas , slower will be its rate of diffusion.

We have to arrange the given gases from slowest rate of diffusion to fastest rate of diffusion that means we need to arrange gases from higher molar mass to lower molar mass.

Molar mass of given gases are :

Cl = 35.5 g/mol

Xe = 131.29 g/mol

He = 4.00 g/mol

N = 14.00 g/mol

So correct order for slowest rate of diffusion (highest molar mass) to fastest rate of diffusion (lowest molar mass) is :

Xe , Cl , N , He

Xe having the highest molar mass will have the slowest rate of diffusion and He with lowest molar mass will have the fastest rate of diffusion, so option 'c' is correct.

Note : Slowest rate of diffusion = High Molar Mass

Fastest rate of diffusion = Low Molar Mass

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4 years ago

What can be absorbed or produced as the result of a chemical reaction???

tia_tia [17]

Heat can be absorbed or produced

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4 years ago