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Anit [1.1K]
3 years ago
12

Given the reaction: 2H₂ + O₂ → 2H₂O The total number of grams of O₂ needed to produce 54 grams of water is _________.

Chemistry
1 answer:
Vedmedyk [2.9K]3 years ago
4 0

Answer : The mass of O_2 needed are, 48 grams.

Explanation :

First we have to calculate the moles of H_2O

\text{Moles of }H_2O=\frac{\text{Given mass }H_2O}{\text{Molar mass }H_2O}=\frac{54g}{18g/mol}=3mol

Now we have to calculate the moles of O_2

The given balanced chemical reaction is:

2H_2+O_2\rightarrow 2H_2O

From the reaction, we conclude that

As, 2 mole of H_2O produces from 1 mole of O_2

So, 3 mole of H_2O produces from \frac{3}{2}=1.5 mole of O_2

Now we have to calculate the mass of O_2

\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2

Molar mass of O_2 = 32 g/mole

\text{ Mass of }O_2=(1.5moles)\times (32g/mole)=48g

Therefore, the mass of O_2 needed are, 48 grams.

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