Chemistry questions: molar mass?

Question

6CO2 + 6H2O ----> C6H12O6 + 6O2

Calculate the molar mass of glucose in the balanced chemical expression.

What percentage of oxygen is in one molecule of glucose?

Answer 1

the molar mass is 180 or 180.1572 if you want to get really exact. You just simple substitute the letters with the molar mass of the molecule they represent. H is 1, C is 12, O is 16, thus (12*6)+(1*12)+(16*6).



The percentage for Oxygen is just the overall mass of oxygen, divided by the total mass. So, (16*6)/(12*6)+(1*12)+(16*6) or 96/180, then just multiply the answer by 100. Giving you 53.33% or, if you used the exact numbers, you get 53.28%



so

1) 180 or 180.1572'

2) 53.33% or %3.28%

Answer 2

molar mass of C6H12O6 (glucose) is: 12(6) + 1(12) + 16(6) = 72 + 12 + 96 = 180 g/mol

mass due to oxygen = 16(6) = 96g/mol

Percent oxygen = (96/180)*100 = 53.33%

The fact that the question asked for one molecule because percentage is just a proportion and since all chemical combinations have constant ratios the ratio (or percentage) of oxygen in glucose will remain the same regardless of how many moles, grams, molecules, etc you have.

Answer 3

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