Question

Determine the mass of each of the following:

(a) 2.345 mol LiCl

(b) 0.0872 mol acetylene, C₂H₂

(c) 3.3×10⁻² mol Na₂ CO₃

(d) 1.23×10³ mol fructose, C₆ H₁₂ O₆

(e) 0.5758 mol FeSO₄(H₂O)₇

Short answer

(a) Mass of LiCl = 236.84 g

(b) Mass of acetylene, C₂H₂ = 2.267 g

(c) Mass of Na₂ CO₃ = 3.465 x 10^-4 g

(d) Mass of fructose, C6 H12 O6 = 0.221 g

(e) Mass of FeSO₄(H₂O)₇ = 152.58 g

Step-by-step solution

Determining the mass of LiCl

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of LiCl = 6 + 35 = 101g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

a) 2.345 mol x 101g/mol = 236.84 g LiCl

Determining the mass of C2H2

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of C₂H₂ = 24 + 2 = 26 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

b) 0.0872 mol x 26 g/mol = 2.267 g

Determine the mass of Na2CO3

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of Na₂CO₃ = 2 x 22 + 12 + 3 x 16 = 105 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

c) 3.3 × 10⁻² mol x 105 g/mol = 3.465 x 10^-4 g

Determine the mass of C6H12O6   

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of C₆H₁₂O₆ = (6 x12) + (12 x 1) + (6 x 16) = 180 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

d) 1.23 × 10³ mol x 180 g/mol = 0.221 g

Determine the mass of FeSO4(H2O)

Given: mol of compounds

To determine the mass of compound the formula is

Number of moles = Wt. in gram/Molecular weight

Wt. in gram = mass

First, we have to determine the molecular weight of the given compounds as follows.

Molecular weight of FeSO₄(H₂O₎₇

= 55 + 32 + 11 x 16 + 2 x 1

= 265 g/mol

By using the following formula, we can calculate mass.

Mass = Number of moles x Molecular weight

e) 0.5758 mol x 265 g/mol = 152.58 g