A storage tank at STP contains 18.9 kg of nitrogen (N2).What is the volume of the tank?

Question

A storage tank at STP contains 18.9 kgkg of nitrogen (N2)(N2).What is the volume of the tank?What is the pressure if an additional 14.2 kgkg of nitrogen is added without changing the temperature?

Answer 1

Hi Pretty, I'm Eddie I can help with this problem.

STP is the standard temperature and pressure for gases. 0C and 1 atm are STP conditions, but 22.4L is standard volume and standard moles is 1 in this problem.

Part 1 If a storage tank at STP has 18.9 kg of N2 what is the volume?

First, calculate the moles of N2 you can approximate it to 14g/mol or see in the periodic table find Nitrogen. But there are 2 Nitrogens so multiply by 2. 28g/mol is the molar mass of N2.

18.9 kg is not in grams so convert to grams by multiplying by 1000 to get 18,900 g x 1 mol/28g then convert to moles by dividing by the molar mass. 675 moles of N2. Using the STP value of 22.4L per 1 mol we multiply to figure out the volume. 15,120 L of N2.

Part 2 is similar but the mass is bigger 18.9 kg is added to 14.2 kg to yield 33.1 kg we do the same steps multiply by 1000 33,100 g x 1 mol/28g then we convert to moles by dividing by the molar mass. 1182.1 moles of N2. Using the STP value of 22.4L per 1 mol we multiply to figure out the volume. 26,480 L of N2.