Question

weight and volume of hydrogen of STP of 65g​

Answer 1

Zn + 2HCl ------------------ ZnCl2 + H2

Mass of Zn reacted = 65g

Moles of Zn = Given mass / Molar mass = 65/65 = 1 mol

1 mole of Zn produces 1 mole of H2 ie 22.4L and 2g.