Question

!. What are the coefficients for this equation so that it balances? HCl(aq) + Al(s)------ H₂(g) + AlCl₃(aq); (Hint- the coefficient add to 13).Just write your answer separated by commas(for example 2,1,4,6)

2. If someone measures out 2.75g of magnesium solid, how many moles is this? In order to answer, yo will need to use the molar mass given in the periodic table.

3. Whic is limiting H₂(g) or O₂(g)?How much water actually forms?

Answer 1

1)

The reaction is:

HCl (aq) + Al (s) —> H2 (g) + AlCl3 (aq)

Balance Cl:

3 HCl (aq) + Al (s) —> H2 (g) + AlCl3 (aq)

Balance H:

3 HCl (aq) + Al (s) —> 3/2 H2 (g) + AlCl3 (aq)

Multiply all by 2:

6 HCl (aq) + 2 Al (s) —> 3 H2 (g) + 2 AlCl3 (aq)

This is balanced equation

Answer: 6, 2, 3, 2

2)

Molar mass of Mg = 24.31 g/mol

mass(Mg)= 2.75 g

use:

number of mol of Mg,

n = mass of Mg/molar mass of Mg

=(2.75 g)/(24.31 g/mol)

= 0.1131 mol

Answer: 0.113 mol

Only 1 question at a time please