Question

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Answer 1

oh Hello!!!

Here is your answer....

a)  Molar mass of Cr₂O₃ = 152

No. of moles of Cr₂O₃ in 50g = 50/152 = 0.33 moles

one mole of Cr₂O₃ reacts with 2 moles of Al, o.33 moles of Cr₂O₃ reacts with:

2 x 0.33 = 0.66 moles of Al

mass of 0.66 moles of Al = 0.66 x 2 = 17.82

b) 2 moles of chromium is produced when 1 mole of Cr₂O₃ reacts with two moles of aluinium. So, mass of Cr produced = 2 x 0.33 x 52 = 34.32g

c) No. of moles in 5 kg is approx 33 moles. So, the answer is: 33 x 52 x 2 = 3432 g= 3.432 Kg

d) No. of moles of Cr₂O₃ in 5 tonnes of Cr₂O₃ = 330000 (approx)

so, again, mass of Cr obtained = 2 x 330000 x 52 = 3432000 g = 3432 Kg = 3.432 tonnes of Cr will be produced

I multiplied with 2, since two moles of chromium is obtained

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