Question

Calculate the number of atoms in hydrogen present in 5.6g of Urea (NH2)2 CO

Answer 1

Answer:

4 mole

Explanation:

The molar mass of urea is 60g/mol. That means that every mole of urea has a mass of 60 grams and that in every gram of urea there are 0.01667 moles . Based on that, we can calculate the moles in 5.6 grams of urea.

5.6 grams * 0.01667 moles per gram = 0.09333 moles

We know that in every mole there are 6.022140857 × 10^23 units of the substance, in this case molecules.

6.022140857 × 10^23 molecules per mole * 0.09333 moles = 5.6207 x 10^22 molecules

The molecular formula of urea is CO(NH2)2 so there are 4 hydrogen atoms in every molecule of urea.

The approximate number of hydrogen atoms in a molecule of urea is 2.248 * 10^23