Question

10) For the reaction: 2H2O(l) + 137 kcal → 2H2 (g) + O2 (g), how many kcal are needed to react 50.0 g H2O(l)?

Answer 1

I want to help u but it's not in my syllabus

Answer 2

Given info : For the reaction,

2H₂O (l) + 137 kCal ⇒2H₂ (g) + O₂ (g),

To find : how many Kcal are needed to react 50g of water , H₂O (l) ?

solution : given mass of Water = 50g

molecular mass of water = 18 g/mol

so no of moles of water = 50/18 = 2.78 mol

from the reaction, it is clear that 137 kCal heat is needed to react 2 moles of water.

so, required amount of heat = 137/2 × 2.78 kCal

= 190.43 kcal

Therefore 190.43 kcal heat is needed to react 50g of water.

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