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Given are: $68g$mass energy bar label and $39g$of carbohydrates and $5g$of fats and $10g$of protein.

To find the kilocalories of given energy bar.

The price of power received for each grams is listed in the table below:

The quantity of energy in a black cherry walnut bar that comes from carbohydrates is computed as follows:

$39g×\frac{4\mathrm{kcal}}{1\mathrm{g}}=150\mathrm{kcal}$

The energy in bar is $150\mathrm{kcal}.$

The quantity of energy in a black cherry walnut bar that comes from fats is computed as follows:

$5g×\frac{9\mathrm{kcal}}{1g}=45\mathrm{kcal}$

The quantity of energy in a black cherry walnut bar that comes from protein is computed as follows:

$10\mathrm{g}×\frac{4\mathrm{kcal}}{1g}=40\mathrm{kcal}$

Given are:$68g$of energy bar label mass and $39g$of carbohydrates and $5g$of fats and $10g$of protein.

To find the kilojoules of bar energy.

The quantity of energy in a black cherry walnut bar that comes from Carbohydrates is computed as follows:

$39\mathrm{g}×\frac{17\mathrm{kJ}}{1g}=660\mathrm{kJ}$

The quantity of energy in a black cherry walnut bar that comes from fats is computed as follows:

$5\mathrm{g}×\frac{38\mathrm{kJ}}{1g}=190\mathrm{kJ}$

The quantity of energy in a black cherry walnut bar that comes from protein is computed as follows:

$10\mathrm{g}×\frac{17\mathrm{kJ}}{1g}=170\mathrm{kJ}$

Given are: $68g$of energy bar label mass and $39g$of carbohydrates and $5g$of fats and $10g$of protein.

To find the how many grammes of the energy bar consume if $160kJ$.

The amount of energy as

$660\mathrm{kJ}+190\mathrm{kJ}+170\mathrm{kJ}=1,020\mathrm{kJ}$

The bar mass as

$160\mathrm{kJ}×\frac{68\mathrm{g}}{1,020\mathrm{kJ}}=11\mathrm{g}$

As a result,the bar mass as$11g.$

Given are: $68g$of energy bar label mass and $39g$of carbohydrates and $5g$of fats and $10g$of protein.

To find the energy required to walk.

The quantity of energy in a black cherry walnut bar is computed as follows:

$1,020\mathrm{kJ}+1,020\mathrm{kJ}=2,040\mathrm{kJ}$

The energy as

$2,040\mathrm{kJ}×\frac{1\mathrm{h}}{840\mathrm{kJ}}=2.4\mathrm{h}$

Aa a result,a person would have to walks for$2.4hrs$ to absorb the power obtained from two black cherry nut bars.