# Urea, chemical formula #(NH_2)_2CO#, is used for fertilizer and many other things. How do you calculate the number of N,C, O, and H atoms in #1.68 x 10^4# g of urea?

##### 1 Answer

You have 1680 grams of urea. It means (in it) there are 787 grams of nitrogen, 112 grams of hydrogen, 336 grams of carbon, and 448 grams of oxygen.

#### Explanation:

Masses:

Nitrogen = 14 grams

Hydrogen= 1 gram

Carbon = 12 grams

Oxygen= 16 grams

In one mole of urea, we have 28 grams of nitrogen, 4 grams of hydrogen, 12 grams of carbon, and 16 grams of oxygen. In other words, one mole of urea has a molecular weight of 60 grams.

The question is: "If you have 1680 grams of urea, what is the mole number in it?"

The solution of this question:

Now, what is the elemental weights in 28 moles of urea:

For nitrogen

For hydrogen

For carbon

For oxygen

The sum of these (