# Stoichiometry, find the mass of the product

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1. Sep 30, 2015

### SelenaT

1. The problem statement, all variables and given/known data

If 1.20 grams of salicylic acid is reacted with excess methanol, what mass of ester should you expect to achieve theoretically?

Molar masses of..
salicylic acid is 138.13g/mol
methanol is 32.05g/mol
ester (methyl salicylate) is 152.16g/mol

Mole ratio
1:1:1

2. Relevant equations

3. The attempt at a solution

1. 1.20 g salicylic acid (1 mol salicylic acid/138.13 g salicylic acid) = 0.008687468 mol salicylic acid

2. 0.008687468 mol salicylic acid (1 mol ester/1 mol salicylic acid) = 0.008687468 mol ester

3. 0.008687468 mol ester (152.16 g ester/1 mol ester) = 1.32 g ester

so 1.32g of ester would be expected.

Is my work correct? or do I have to use the excess reagent to find the mass of the product?

2. Sep 30, 2015

### Bystander

Looks good. Any reason to suspect "xs" would change your result?

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