Question

Chemistry help

Answer 1

late response, but in case you still needed help w/ this -

the equation is balanced (always check first) so we can go straight to the stoichiometry.

we start w/ 45.0 moles of hydrogen gas. notice the coefficients in the equation - 2 moles hydrogen gas produces 2 moles water. so for every 1 mole of hydrogen, we produce 1 mole of water. so 45.0 moles of hydrogen produces 45.0 moles of water. from there, convert 45.0 moles of water to grams by multiplying by the molar mass.