Question

heat capacity of water is 18 calorie per degree mole the quantity of heat to rise temperature of 18 gram water by 0.2 degree Celsius is X calorie. the amount of ch4 to be burnt to produce X calorie.

(heat is ∆H=-200k.cal)​

Answer 1

0.00030448 moles of CH4 are required to produce heat.

Explanation:

Heat capacity of water (C) = 18 cal /degree mol

Mass of water m = 18g

Temperature change ∆T = 0.2 0C

Amount of heat needed to raise the temperature (q)  = ?

q = mC ∆T

= 18X18 X0.2

= 64.8cal

Burning of 1 mole of methane produce 212821.9 Cal of heat

mole = 64.8/ 212821.9

 = 0.00030448 moles

Thus 0.00030448 moles of CH4 are required to produce heat.

Hope it helps!!!