Answer to Question #32738 in Inorganic Chemistry for suraj chaudhary

Question

Find % of carbon in glucose?

Answer 1

First you need to find the molar mass of your molecule, in this case glucose.
To do this find the molar mass of Carbon, which is 12 g per mole multiply it by how many carbons in glucose, which is 6.
12*6 = 72. So we have 76 g of carbon.

We need to find the molar mass of Hydrogen now, this is 1g per mole. We have 12 hydrogens. 12*1=12 So we have 12 g of hydrogen.

Next find the molar mass of Oxygen. This is 16g per mole. We have 6 oxygens. 6*16 = 96. So we have 96g of Oxygen.

Now we add up all three to get the molar mass. 72 + 12 + 96 = 180 g of glucose or C₆H₁₂O₆

So to find percent by mass take the grams of carbon you have and divide it by the total grams of the molecule you have.

In this case 72/180 = 0.4 take this and multiply by 100 and we are given our percent mass which is 40 %.