21. A 8.0 L sample at 25 °C and 1.00 atm of pressure contains 0.5 moles of a gas. If an additional 0.75 moles of gas at the same pressure and temperature are added, what is the final total volume of the gas? a. 20 L b. 20 ml c. 30 L d. 25.5 L

Question

21.   A 8.0 L sample at 25 °C and 1.00 atm of pressure contains 0.5 moles of a gas. If an additional 0.75 moles of gas at the same pressure and temperature are added, what is the final total volume of the gas?   a.  20 L   b.  20 ml   c.  30 L   d.  25.5 L

surry99 · Answer

Use the ideal gas law:
PV = nRT
you need V so:
V=nRT/P
 n= 1.25 moles
 R = .0821 L.atm/mol.K
 T = 298 K (T must be in Kelvin)
 P = 1 atm