What is the mass of oxygen required to react completely with 15g of $H_{2}$ gas to form water?

140g

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115g

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107.5g

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120g

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Solution

The correct option is D
120g

$2 H_{2} + O_{2} ⟶ 2 H_{2} O$

4g Hydrogen takes up 32g oxygen

15g Hydrogen takes up $\frac{32}{4} \times 15$ =120g oxygen.

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What is the mass of oxygen required to react completely with 15g of H2 gas to form water?

The correct option is D 120g 2H2+O2⟶2H2O 4g Hydrogen takes up 32g oxygen 15g Hydrogen takes up 324×15 =120g oxygen.

What is the mass of oxygen required to react completely with 15g of $H_{2}$ gas to form water?

The correct option is D
120g

$2 H_{2} + O_{2} ⟶ 2 H_{2} O$

4g Hydrogen takes up 32g oxygen

15g Hydrogen takes up $\frac{32}{4} \times 15$ =120g oxygen.