Question

# 1. The radius of a copper (Cu) atom is roughly 1.3 × 10−10 m. How many...

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

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