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6. Calculate number of atoms of hydrogen present in5.6g of urea (molar mass of urea = 60g mol-1).Also calculate number of atoms of N, C and O |
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Answer» 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 No of atoms of Nitrogen = half of the number of atoms of H = 1.12 x 10^23 atoms of N No of atoms of C or O = half of the number of atoms of N = 0.56 x 10^23 atoms of C or O = 5.6 x 10^22 atoms of C or O |
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