How many moles of gas are in a 1.50L tank at a pressure of 965mmHg and a temperature of 15.0°C

There are 0,081 moles.

Explanation:

We convert the unit of temperature in Celsius into Kelvin and the pressure in mmHg into atm:

0°C= 273K --> 15°C= 15 + 273= 288 K

760 mmHg1 atm

965 mmHgx= (965 mmHg x 1 atm)/760 mmHg= 1, 27 atm

We use the formula:

PV=nRT ---> n= PV/RT

n=  1, 27 atm x 1, 5 L/0,082 l atm/K mol x 288K

n=0,08066565 mol

10 years is the answer