When a container is filled with 3 moles of helium gas, 2 moles of oxygen gas, and 1 mole of carbon dioxide gas, the pressure in
2 answers:
Answer:
B. 262 kPa
Explanation:
First we must find the total of moles in the container:
3 moles of helium + 2 moles of oxygen + 1 mole s of carbon = 6 moles.
of the total of moles, 2 are oxygen, so the fraction of oxygen in the container is
Thus, the partial pressure of the oxygen gas must be a third of the total pressure in the container:
Partial pressure of the oxygen gas =
The answer is B. 262 kPa
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Answer:
A) Sample B has more calcium carbonate molecules
Explanation:
M = Molar mass of calcium carbonate = 100.0869 g/mol
= Avogadro's number =
For the 4.12 g sample
Moles of a substance is given by
Number of molecules is given by
For the 19.37 g sample
Number of molecules is given by
So, sample B has more calcium carbonate molecules.
The ratio of the elements of carbon, oxygen, calcium atoms, ions, has to be same in both the samples otherwise the samples cannot be considered as calcium carbonate. Same is applicable for impurities. If there are impurites then the sample cannot be considered as calcium carbonate.