The combustion of how many moles of ethane (c2h6) would be required to heat 851 g of water from 25.0°c to 98.0°c? (assume liquid water is formed during the combustion.)

Answer : The number of moles of ethane required will be 0.166 mole.

Explanation :

First we have to calculate the heat absorbed by water.

where,

q = heat absorbed = ?

m = mass of water = 851 g

c = specific heat of water =

= final temperature =

= initial temperature =

Now put all the given values in the above formula, we get:

        (1 kJ = 1000 J)

Now we have to calculate the moles of ethane required.

where,

= enthalpy of combustion of ethane = 1560.7 kJ/mol (standard value)

q = heat absorbed = 259.67 kJ

n = number of moles of ethane = ?

Therefore, the number of moles of ethane required will be 0.166 mole.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.