STUCK ON THESE TWO AS WELL?

2017-11-22 2:01 pm

- Given the formula
P_2 + 3Cl_2 -> 2PCl_3
Calculate the grams of PCl_3 produced from 10 g of P_2

- Given the formula
P_2 + 3Cl_2 -> 2PCl_3
Calculate the grams of Cl_2 used to react with 25 g of P_2

回答 (2)

戇戇居士

2017-11-22 3:26 pm

✔ 最佳答案

1.
Molar mass of P₂ = 31.0 × 2 g/mol = 62.0 g/mol
Molar mass of PCl₃ = (31.0 + 35.5×3) g/mol = 137.5 g/mol

P₂ + 3Cl₂ → 2PCl₃
Mole ratio P₂ : PCl₃ = 1 : 2

No. of moles of P₂ reacted = (10 g) / (62.0 g/mol) = 0.1613 mol
No. of moles of PCl₃ produced = 0.1613 mol × 2 = 0.3226 mol
Mass of PCl₃ produced = (0.3226 mol) × (137.5 g/mol) = 44.4 g

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2.
Molar mass of P₂ = 31.0 × 2 g/mol = 62.0 g/mol
Molar mass of Cl₂ = 35.5 × 2 g/mol = 71.0 g/mol

P₂ + 3Cl₂ → 2PCl₃
Mole ratio P₂ : Cl₂ = 1 : 3

No. of moles of P₂ reacted = (25 g) / (62.0 g/mol) = 0.4032 mol
No. of moles of Cl₂ produced = 0.403 mol × 3 = 1.21 mol
Mass of Cl₂ produced = (1.21 mol) × (71.0 g/mol) = 85.9 g

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[匿名]

2017-11-22 2:05 pm

who the fk cares

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