Blog

10. How many moles of O atoms are in 2.50 mol of CO₂?

15. A sample has 5.0 × 10²³ molecules of CH₄. How many moles is this?

9. If a compound’s empirical formula is CH₂O and its molar mass is 180 g/mol, what is its molecular formula?

12. How many moles of Na⁺ are in 2.00 L of 1.50 M Na₂SO₄ solution?

6. What is the molar mass of glucose (C₆H₁₂O₆)?

12. How many grams of NH₃ can be produced from 2.0 mol N₂ and excess H₂ in: N₂ + 3H₂ → 2NH₃?

14. How much heat is absorbed when 25.0 g ice melts at 0°C? ΔHfus = 6.02 kJ/mol

1. What does excess reagent mean?

3. Why is bond energy important in thermochemistry?

14. How many moles of CO₂ are formed from 25.0 g CaCO₃ decomposed? CaCO₃ → CaO + CO₂