What volume is occupied by 2.719 x 10^13 moles of methane gas, CH4?

Answer 1

The volume occupied by a gas will depend on the temperature and pressure. Since these variables are not given, we’ll assume STP (standard temperature and pressure). At STP 1 mole of gas occupies 22.4 liters (memorize this value)

2.719x10¹³ moles x 22.4 L/mole = 6.09x10¹⁴ liters

If you meant 2.719x10¹³ molecules, then we have...

2.719x10¹³ molecules x 1 mol/6.02x10²³ molecules x 22.4 L/mole = answer