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# Molar Mass of a Compound from Weight

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One molecule of a compound weighs 2.03 E-22 g. Its molar mass is:

a. 48 gram per mole
b. 92.1 gram per mole
c. 114 gram per mole
d. 122 gram per mole

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https://brainmass.com/chemistry/stoichiometry/molar-mass-of-a-compound-from-weight-89806

#### Solution Summary

Brief calculations to find the molar mass of a compound given its total weight.

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## Molecular Weights and Percent of Element by Mass

1. Calculate the molecular weight of the following compounds:

Al2(SO4)3 ____________________ SbBr5 ____________________

Fe(NO3)3 ____________________ C9H11NO2 ____________________

2. Calculate the number of moles in 25 grams of each of the following compounds:

C9H11NO2 ____________________

Al2(SO4)3 ____________________

3. Calculate the number of grams of each in 1.25 mol of the following compounds:

Fe(NO3)3 ____________________

SbBr5 ____________________

4. Calculate the percent of each element present in the following compounds:

C9H11NO2 C = __________ H = __________ N = __________ O = __________

Fe(NO3)3 Fe = __________ N = __________ O = __________

5. Determine the empirical formula for the following compounds whose % compositions are given below:

49.41% C, 4.56% H, 32.87% Br, 13.16% O ____________________

36.76% Fe, 21.11% S, 42.13% O ____________________

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