How
many moles of hydrogen gas will form if 0.35 moles of Na reacts with an
excess of water?

0.8 moles

Explanation:

2H2+O2 —›2H2O

Since , from given balanced chemical Equation.

2moles of H2 produce 2 moles of Water

So,

2moles H2= 2moles H2O

1moles H2= 1 mole of H2O

For 0.8 mole of H2O, multiply both sides by 0.8

0.8 H2=0.8 H2O

0.8 mole of H2= 0.8 mole H2O

So answer is 0.8 moles

if you're asking what comes out, it's steam.

the correct answer would be d. hope this !