Question

1. The radius of a copper (Cu) atom is roughly 1.3 × 10⁻¹⁰ m. How many times can you divide evenly a 55.84−cm long piece of copper wire until it is reduced to two separate copper atoms? (Assume there are appropriate tools for this procedure and that copper atoms are lined up in a straight line, in contact with each other. Round off your answer to an integer.)

2. How many grams of gold (Au) are there in 28.32 moles of Au?

3. 2CO(g) + O₂(g) → 2CO₂(g). Starting with 3.38 moles of CO, calculate the number of moles of CO₂ produced if there is enough oxygen gas to react with all the CO.

4. 2NH₃(g) + H₂SO₄(aq) →(NH₄)₂SO₄(aq). How many kilograms of NH₃ are needed to produce 2.60 ×10⁵ kg of (NH₄)₂SO₄?

5.

(a) C₂H₄O₂(l) + 2O₂ → 2CO₂(g) + 2H₂(l)

	combustion
	combination
	decomposition

(b) 2Na(s) + Cl₂(g) → 2NaCl(s)

	combustion
	combination
	decomposition

Answer 1