Thanks for that brenton, i think i've got those types of questions down pat
However i'm not quite sure on some other ones like these:
1) CO(g) reacts with H<sub>2</sub> to form CO<sub>2</sub>(g) and H<sub>2</sub>(g) What is the percentage yield if 1.8g H<sub>2</sub>(g) gas is formed starting with 50.0g of CO(g) and 40.0g of H<sub>2</sub>?
Answer is 50%
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2) The number of grams of O<sub>2</sub> required to convert 1.0 gram of H<sub>2</sub> to H<sub>2</sub>O is?
Answer is 8.0g
EDIT: I think i did Question 2 but i'm not sure...is the question basically asking you to find the minimum mass of oxygen needed for it to be a limiting reagent?
Hydrogen
mass - 1 g
molar mass - 2.0158 g.mol-1
moles - 0.4961 mol
1 stoichiometric mole of hydrogen = 0.2480
Oxygen
mass - ?
molar mass - 31.998 g.mol-1
moles - 0.2480 (using the value from above?)
Mass = 31.998 x 0.2480 = 7.935 ~ 8g