When 35.4 L NH3 and 40.5 L O2 gas at STP burn, NO and H2O produced. Now ? g NO?

Question

After the products return to STP, how many grams of nitrogen monoxide are present?
NH3(g) + O2(g) -------> NO(g) + H2O(l) [unbalanced]

Answer 1

use the these to help u aswell:

STP: 22.4 L
273k
1 atm (if ur doing something to do with pressure later this will help)

number of moles = mass/molecular mass

Answer 2

Well, let's help you by balancing the equation:

4NO + 5O2 ----> 4NO + 6H2O

Now you can work out the moles of reactants and products.