Question

What is the mass of oxygen required to react completely with 15 g of H₂
gas to form water?
A) 140 g B) 115 g C) 107.5 g D) 120 g

Answer 1

Answer:

D) 120 g

Explanation:

When free oxygen reacts with hydrogen the reaction is as follows-

2H2 + O2 = 2H2O

2 moles of hydrogen + 1 mole of oxygen → 2 moles of water

1 moles of hydrogen reacts with 1/2 mole of oxygen gas

For H2

W1 = 15g

M1 = 2×1 = 2g

n1 = W1/M1 = 15/2 moles

For O2

n2 = 0.5 × 15/2 = 15/4 moles

M2 = 16×2 = 32g

W2 = n1×M1 = 15/4 × 32 = 120g

Theoretically, mass of oxygen reacted is 120 g.

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Answer 2

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ATQ..

2H2+O2-->2H2O

2 moles of H2 require one mole of O2

15g of H2 require 7.5 g of O2

Ure ans is 7.5 grams.

Plz check ure options and statement.

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