2n2h4 + n2o4 → 3n2 + 4h2o

how many grams of n2h4 will be consumed by 92 g of n2o4?

16 g

128 g

64 g

32 g

With N2O4's molar mass of 92 grams/mole, there is 1 mole of N2O4 being used.
For every one mole of N2O4 used, two moles of  N2H4 are used.
2 moles of N2H4 times the molar mass of N2H4 (32g/mol)
2 moles * (32 grams/mole) = 64 grams

Density and pressure