Question

If hydrogen and oxygen combine in ratio of 1:8 by mass respectively to form water molecule. Explain how many moles of water will be formed using 10moles of H gas and 5moles of O2 gas?

Answer 1

Hii There!!!


In the given question ,

Since , Atomic Mass of H2 = 1 × 1 = 2g
and Atomic mass of O2 = 16 g

So,

Mass of hydrogen = 2 × 10 = 20g

∴ No. of moles of hydrogen = 20 moles.

Similarly ,

Mass of oxygen = 16 × 5 = 80g

∴ No. of moles of oxygen = 80 moles


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Now , We know that

80 grams of Oxygen reacts with 10 grams of Hydrogen which will give 80 + 10 = 90 g of water..

So, we will get the following equation =>

H2 + O2 ------> 2H2O

=> 10g + 80g ------> 90g

Also, By using the formula =>

No. of moles = Given mass / Molar mass

=> No. of moles = 90 /18 = 5

Hence, number of moles = 5 moles of water.



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Hope it helps :)