Question

zinc metal can be obtained from zinc oxide zno by reacting the oxide with the element carbon the products of the reaction are Zn and CO2 what mass in grams of zinc oxide is needed to react completely with 5.00 mol of carbon

Answer 1

Answer:

814 g

Explanation:

Let's consider the following reaction.

2 ZnO + C → 2 Zn + CO₂

The molar ratio of ZnO to C is 2:1. The moles of ZnO required to react with 5.00 mol of C are:

5.00 mol C × (2 mol ZnO/1 mol C) = 10.0 mol ZnO

The molar mass of ZnO is 81.38 g/mol. The mass corresponding to 10.0 moles is:

10.0 mol × 81.38 g/mol = 814 g

Answer 2

Answer:

Mass of Zn required to completely react with % moles of C is 813.8g

Explanation:

Consider the reaction equation:

2 ZnO + C→  2 Zn + CO2

The coefficient ratio of this reaction shows that for every 2 moles of ZnO, I would need 1 mole of C.

2 moles ZnO - 1 mole C

x moles of Zno - 5 moles C [cross multiply]

⇒ x = 10 moles of ZnO produced from 5 moles of C

But 1 mole of ZnO is given as 81.38 g (i.e 65.38 + 16)

10 moles = 81.38 × 10

= 813.8g  of Zn