How many moles are in 454 Liters of a gas?

What is important to study for nios grade 12 chemistry? i have only one month left.

Cucl2 + 2nano3 cu(no3)2 + 2nacl what is the percent yield of nacl if 31.0 g of cucl2 reacts with excess nano3 to produce 21.2 g of nacl? 49.7% 58.4% 63.6% 78.7%

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.