Question

Determine the mass of each of t he following:

Answer 1

Explanation:

Mass of compounds = Moles of compound × Molecular mass of compound

a) Moles of LiCl = 2.345 mol

Molecular mass of LiCl = 42.5 g/mol

Mass of 2.345 moles of LiCl = 2.345 mol × 42.5 g/mol = 99.6625 g

b) Moles of acetylene = 0.0872 mol

Molecular mass of acetylene= 26 g/mol

Mass of 0.0872 moles acetylene= 0.0872 mol × 26 g/mol = 2.2672 g

c) Moles of sodium carbonate= $3.3\times 10^{-2}mol$

Molecular mass of sodium carbonate= 106 g/mol

Mass of  $3.3\times 10^{-2}mol$ sodium carbonate

=  $3.3\times 10^{-2}mol\times 106 g/mol$= 3.498 g

d) Moles of fructose = $1.23\times 10^3 mol$

Molecular mass fructose= 180 g/mol

Mass of  $1.23\times 10^3 mol$ fructose

=  $1.23\times 10^3mol\times 180 g/mol = 221,400 g$

e) Moles of  $FeSO_4(H_2O)_7=0.5758 mol$

Molecular mass of $FeSO_4(H_2O)_7 =278 g/mol$

Mass of  $1.23\times 10^3 mol$ fructose

=  $0.5758 mol\times 278 g/mol= 160.0724 g$