# Acetamide has the molecular formula CH3CONH2. Which element makes up the greatest percentage by mass of acetamide?

##### 1 Answer

May 21, 2018

Carbon has the greatest percent by mass at

#### Explanation:

To find the mass, add all the elements' masses together. Let's make a list to find the mass by element.

Carbon (2 of them) - weighs 12.011g ; 2 of them, so multiply by 2:

Hydrogen (5 of them) - weighs 1.008 ; 5 of them, so multiply by 5:

Oxygen (1 of them) - weighs 15.999g

Nitrogen (1 of them) - weighs 14.007g

Add these numbers together:

Now, make a ratio of the highest amt. element to the whole: