The enthalpy of combustion of hard coal averages -35 kj/g, that of gasoline, 1.28 x 105 kj/gal. how many kilograms of hard coal provide the same amount of hat as is available from 1.0 gallon gasoline? assume that the density of gasoline is 0.692 g/ml(the same s density of isooctane).

3.657 kg

Explanation:

Given:

Enthalpy of combustion of hard coal = -35 kJ/g

Enthalpy of combustion of gasoline = 1.28 × 10⁵ kJ/gal

Density of gasoline = 0.692 g/mL

now,

The heat provide 1 gallon of gasoline provide =  1.28 × 10⁵ kJ

and,

heat provided by the 1 gram of coal  = 35 kJ

or

1 kJ of heat is provided by (1/35) gram of hard coal

therefore,

For 1.28 × 10⁵ kJ of heat, mass of hard coal =  1.28 × 10⁵ kJ × (1 / 35)

or

For 1.28 × 10⁵ kJ of heat, mass of hard coal = 3657.14 grams = 3.657 kg

the maximum mass of nh3 is nh3 in grams

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.