Answer :
The formula D= M/V is used at STP where,
M is equal to the molar mass and,
V is molar volume of a gas (22.4 liter/mole).
At Standard Temperature and Pressure (STP), 1 mole of any gas will occupy a volume of 22.4 L.
The Ideal Gas Law, along with a balanced chemical equation, can be used to solve for the amount, either in volume or mass, of gas consumed or produced in a chemical reaction.
The molar mass of a gas can be derived from the ideal gas law, PV=nRT , by using the definition of molar mass to replace n , the number of moles.
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