Question

2. How many moles of gas are contained in a scuba diver's 12.6-L tank filled with 3422 psi of air А) 1760 moles B) 2.10x10' moles C) 120. moles D) 1430 moles at 25 °C? (1 atm - 14.7 psi) Answer

Answer 1

volume V = 12.6 liters

temperature T = 25 c = 298 K

1 atm ------------------> 14.7 psi

? --------------------------> 3422 psi

=>3422 / 14.7 => 232.8 atm

gas constant R = 0.0821 latm /k mol

using the ideal gas equation PV = nRT

=> n = PV /RT

=> n = 232.8 * 12.6 / 0.0821 *298

=> n = 119.887 moles

i.e n = 120 moles

answer => C) 120 moles