Jharkhand PSC Prelim Exam 2006 Solved Paper

Question : 53 of 100

Marks: +1, -0

One mole of hydrogen gas in excess oxygen at water gives heat of 299kg. 4 grams of hydrogen gas burns in those circumstances,there how is much heat generation?

145 kg
290 kg
580 kg
1160 kg

Validate

Solution:

(3) Using the periodic table,we can get the atomic mass,which tells how many grams of hydrogen are in 1 mole. In this case, the periodic table shows there is 1g of hydrogen per mole. Dihydrogen

(H_2)

has 2 hydrogen atoms per molecule, so there will be 2 *1g hydrogen per mole = 2g dihydrogen per mole.

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