"a 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a volume of 20.46 l at 123°c and 1.35 atm. what would be its volume at 468°c and 1.35 atm? "

Charles law states that volume of gas is directly proportional to volume of gas at constant pressure  

parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation 
where 
V - volume 
T - temperature in kelvin
T1 - 123 °C + 273 = 396 K
T2 -  468 °C + 273 = 741 K
substituting the values

V = 38.29 L 
new volume is 38.29 L

The metal is named first

The correct answer is b.hoped i you