Question

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Answer 1

Answer:

Q1) Given mass of Calcium = 60g

molecular mass of Ca = 40g

No. of moles of Ca = 60/40 =1.5 mol

Now,

From the chemical reaction, we can see that, 1 mole of Ca requires 1 mole of Cl2, to form 1 mole of CaCl2.

Therefore, 1.5 moles of Ca will need 1.5 moles of Cl2.

Now,

No. of moles of Cl2 = 1.5 mol

molecular mass of Cl2 = 35.5

So, required mass = 1.5 × 35.5 = 53.25 g

Hence, mass of Cl2 required = 53.25 g

Q2) Chemical reaction -:

C + O2 ----> CO2

Mass of carbon = 18g

molar mass = 12g

No. of moles = 18/12 = 1.5 moles

now, 1 mole of C requires 1 mole of O2.

Therefore, moles of O2 = 1.5 moles

Molar mass of O2 = 16 × 2 = 32g

We know, required mass of O2 = 1.5 × 32 = 48 g

Hence, We require 48 g of O2.