Please Help!!! I don't understand Stoichiometry

Question

Using the following equation how many grams of water do you get from 635.2g of glucose:

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

 

Give answer as #unit space name

Answer 1

Hi Anthony,

 

The reaction is saying, that for every 1 mole of glucose and 6 mole oxygen; 6 mole of carbon dioxide and 6 mole water are made.

 

First convert to moles using the molecular weight of glucose, 180.16 g/mol

 

 

635.2 g * (1 mol / 180.16 g) = 3.53 mol glucose

grams cancel and you're left with the number of mole glucose

 

For every 1 mole glucose we get 6 mole water. The ratio is 1:6

 

3.53 mol glucose * (6 mol water / 1 mol glucose) = 21.15 mol water

mole glucose cancels and you're left with the number of mole water

 

Now use the molecular weight of water, 18.02 g/mol  to convert back to grams

 

21.15 mol * (18.02 g / 1 mol) = 381.2 g water

Mole water cancels and you're left with grams water