lithium metal reacts with water to give lithium hydrogen gas. if 275 mL of hydrogen gas is produced at STP, wh

Answer 1

Li + H2O -> LiO + H2

275 ml H2/22.4 L/mol = 1.23E-2 mol H2

1.23E-2 mol Li * 6.94 g/mol = 0.0852 g Li (to 3 sig figs)

(again)