Calculate number of atoms of hydrogen present in 5.6 g of urea (molar mass of urea = 60g mot⁻¹). Also calculate number of atoms of N, C and O.
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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
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
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