Question

a 5 gram sample of zinc is added to hydrochloric acid. The amount of hydrochloric acid is sufficient to allow the zinc to react cmpletely. what mass of hydrogen gas does this reaction produce?

Answer 1

When zinc reacts with hydrochloric acid, it produces hydrogen gas. The mass of hydrogen gas produced in this reaction is also 5 grams.

Step-by-step explanation:

When zinc reacts with hydrochloric acid, it produces hydrogen gas.

The balanced equation for the reaction is: Zn(s) + 2HCl(aq) -> ZnCl2(aq) + H2(g)

Since the reaction is balanced, we can determine the mass of hydrogen gas produced by stoichiometry. The molar mass of zinc is 65.38 g/mol, and the molar mass of hydrogen gas is 2.02 g/mol. From the balanced equation, we can see that 1 mole of zinc reacts to produce 1 mole of hydrogen gas. Therefore, the mass of hydrogen gas produced is also 5 grams.

Answer 2

0.154g of H2

Step-by-step explanation:

First, we'll begin by writing a balanced equation for the reaction between zinc (Zn) and hydrochloric acid (HCl). This is illustrated below:

Zn +2HCl —> ZnCl2 + H2

Next, let us determine the mass of Zn that reacted and the mass of H2 formed from the balanced equation.

This is illustrated below:

Molar Mass of Zn = 65g/mol

Molar Mass of H2 = 2x1 =2g/mol

From the balanced equation above,

65g of Zn produced 2g and H2.

Therefore, 5g of Zn will produce = (5 x 2) /65 = 0.154g of H2

From the calculations made above, 5g of Zn produced 0.154g of H2