How many moles of methane gas CH4 are in a 1.00*10^5L storage tank at STP? How many grams of methane is this? How many grams CO2 gas could the same tank hol

Question

I am needing help answering chemistry homework 

Answer 1

Hi Deliesha!

 

*How many moles of methane in the tank?

So we know that at STP 22.4 L=1 mol of gas. The problem states that  you have 1.00x10^5 L of gas so we can set up this problem:

 

1.00x10^5 L * 1 mol/ 22.4 L = 4.46 x 10^3 mol of gas

 

*How many grams of methane is this?

We can find that the molecular mass of methane (CH4) is 12.01*1+1.008*4=16.04 g/mol

 

4.46x10^3 mol * 16.04 g/mol = 7.16x10^4 g methane

 

*How many grams of CO2 in the same tank?

We go back to the first piece of information: 1.00x10^5 L of gas in the tank and solve the problem exactly the same way as we did for methane:

molecular mass of CO2= 12.01*1+16.00*2=44.01 g/mol

 

1.00x10^5 L * 1mol/ 22.4 L * 44.01g/mol= 1.96x10^5 g methane

 

I hope this helps! Feel free to let me know if you have further questions!