Making water

Chemistry Level 4

Hydrogen gas is ignited with oxygen gas to produce water. If 40 40 N oxygen gas in 50 50 ml of solution is added to 66.67 66.67 N hydrogen gas in 75 75 ml of solution, then find the weight of water formed in grams.


The answer is 72.

Ashish Menon by Ashish Menon , 20, India

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1 solution

Ashish Menon
Apr 27, 2016

For hydrogen:-
Let moles included be x x
Then 66.67 = x 75 × 1000 x = 5 66.67 = \dfrac{x}{75} × 1000\\ x = 5

For oxygen:-
Let moles included be y y .
Then 40 = y 50 × 1000 y = 2 40 = \dfrac{y}{50} × 1000\\ y = 2

2 H X 2 + O X 2 → 2 H X 2 O \ce{2H_2 + O_2 -> 2H_2O}
Lets see the ratio of the moles to the stoichiometry coefficients of the reactant.
For hydrogen it is 5 2 = 2.5 \dfrac{5}{2} = 2.5
For oxygen it is 2 1 = 2 \dfrac{2}{1} = 2
Since oxygen has lower ratio, it is limiting.

Now, 1 mole of oxygen produces 2 moles of water.
So, 2 moles of oxygen produces 4 moles of water which is equal to 4 × 18 = 72 g 4 × 18\\ = \boxed{72}g

2 Helpful 0 Interesting 0 Brilliant 0 Confused

Same way. (+1) for solution.

Samara Simha Reddy - 5 years, 1 month ago

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Thanks, great. But sad part is that not many people use chemistry in brilliant :3

Ashish Menon - 5 years, 1 month ago

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