Question

Given the balanced equation, calculate the mass of product that can be prepared from 2.36 g of zinc metal.

2Zn + O2 2ZnO

Answer 1

To calculate the mass of the product, you need to use stoichiometry. Convert the given mass of zinc metal to moles, then use the molar ratio to find the moles of zinc oxide produced. Finally, convert moles of zinc oxide to grams using the molar mass.

Step-by-step explanation:

To calculate the mass of product that can be prepared from 2.36 g of zinc metal, we need to use stoichiometry. From the balanced equation 2Zn + O2 -> 2ZnO, we can see that the molar ratio between zinc and zinc oxide is 2:2. Therefore, for every 2 moles of zinc, we get 2 moles of zinc oxide.

First, we need to convert 2.36 g of zinc metal to moles using the molar mass of zinc (65.39 g/mol):

1. 2.36 g zinc * (1 mol zinc / 65.39 g zinc) = 0.036 moles zinc

Since the molar ratio between zinc and zinc oxide is 2:2, we can say that 0.036 moles of zinc will produce 0.036 moles of zinc oxide.

Finally, we convert moles of zinc oxide to grams using the molar mass of zinc oxide (81.38 g/mol):

1. 0.036 moles zinc oxide * (81.38 g zinc oxide / 1 mol zinc oxide) = 2.93 g zinc oxide

Therefore, the mass of product that can be prepared from 2.36 g of zinc metal is 2.93 grams of zinc oxide.

Answer 2

1) Balanced chemical reaction: 2Zn + O2 -> 2ZnO

2) molar ratios: 2 mol Zn: 2mol ZnO

3) number of moles of Zn, n = grams / molar mass

n = 2.36 g / 65.39 g/mol = 0.036 mol of Zn

4) Given that a number of moles of Zn that react produces the same number of moles of ZnO, the number of mols of ZnO is 0.036

5) Convert to grams using the molar mass of ZnO

molar mass of ZnO = 65.39 g/mol + 16g/mol = 81.39 g/mol

=> grams of ZnO = 0.036 mol * 81.39 g/mol = 2.94 grams

Answer: 2.94 grams