Question

Calculate the mass in grams of 3mole of Zinc atomic mass of zinc 65.4u

Answer 1

Answer:

moles = mass / molar mass

Explanation:

moles = 3

molar mass = 65.4

so,

    3 = mass / 65.4

    mass = 3* 65.4

    mass = 196.2 g

Answer 2

Answer:Zn(s)+2HCl(aq)→ZnCl2​(aq)+H2​(g)

1 mole of Zn reacts with 2 moles of HCl to produce 1 mole of hydrogen.

The atomic mass of Zn is 65.4 g/mol. The molar mass of HCl is 36.5 g/mol.

When we divide mass with atomic/molar mass, we get number of moles.

Number of moles of Zn =65.465​=0.994 moles.

Number of moles of HCl =36.565​=1.78  moles.

0.994 moles of Zn will react with 2×0.994=1.988  moles of HCl however only 1.78 moles of HCl are present. Hence, HCl is the limiting reactant.

1.78 moles of HCl will produce 21.78​=0.89 moles of H2​.

The molar mass of H2​ is 2 g/mol.

Mass of H2​ obtained =2g/mol×0.89mol=1.78g=1.8g

Explanation:pls thank me