A compound was found to contain nitrogen and oxygen in the ratio 28g:80g. The formula of the compound is:
Correct answer: D. N2O5
- A. NO
- B. N2O3
- C. N2O4
- D. N2O5
Explanation
Mass of nitrogen is 14 g and mass of oxygen is 16 g. Dividing nitrogen's mass in compound (28g) by 14g gives us 2. Dividing oxygen's mass in compound (80g) by 16g gives us 5. So we can now say that the molar ratio of N to O is 2:5 that means the formula is N2O5
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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