Determine the molar mass of each empirical formula. The molar mass of each compound divided by its empirical formula mass gives the number of times the empirical formula is within the molecule. Multiply the empirical formula by the number of times the empirical formula appears to get the molecular

Question

Determine the molar mass of each empirical formula. The molar mass of each compound divided by its empirical formula mass gives the number of times the empirical formula is within the molecule. Multiply the empirical formula by the number of times the empirical formula appears to get the molecular formula.

Accepted Answer

Only approximate whole number values are needed.
a) [latex] ext{CH}_2[/latex] has empirical mass equal to 14.03 g/mol

[latex]\left\lgroup\frac{42.08 ext{ g/mol}}{14.03 ext{ g/mol}} ight group =3[/latex]

Multiplying the subscripts in [latex] ext{CH}_2[/latex] by 3 gives [latex] ext{C}_3 ext{H}_6[/latex]
b) [latex] ext{NH}_2[/latex] has empirical mass equal to 16.03 g/mol

[latex]\left\lgroup\frac{32.05 ext{ g/mol}}{16.03 ext{ g/mol}} ight group =2[/latex]

Multiplying the subscripts in [latex] ext{NH}_2[/latex] by 2 gives [latex] ext{N}_2 ext{H}_4[/latex]
c) [latex] ext{NO}_2[/latex] has empirical mass equal to 46.01 g/mol

[latex]\left\lgroup\frac{92.02 ext{ g/mol}}{46.01 ext{ g/mol}} ight group =2[/latex]

Multiplying the subscripts in [latex] ext{NO}_2[/latex] by 2 gives [latex] ext{N}_2 ext{O}_4[/latex]
d) CHN has empirical mass equal to 27.03 g/mol

[latex]\left\lgroup\frac{135.14 ext{ g/mol}}{27.03 ext{ g/mol}} ight group =5[/latex]

Multiplying the subscripts in CHN by 5 gives [latex] ext{C}_5 ext{H}_5 ext{N}_5[/latex]

Question 3.27: Determine the molar mass of each empirical formula. The mola......

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