Chemistry: How many calories are in a sample of a snack food containing 125 calories?

How many calories are in a sample of a snack food

morbidodyssey

15.06.2022

Q = -627.6 J

Explanation:

Mass, m = 15 grams

Initial temperature, $T_i=40^{\circ} C$

Final temperature, $T_f=30^{\circ} C$

We need to find the amount of heat released by this much of sample of water. We know that heat released is given by the below formula :

$Q=mc\Delta T$

c is specific heat of water, $c=4.184\ J/g-K$

$\Delta T=T_f-T_i\\\\=(30^{\circ}-40^{\circ} )\ C\\\\=-10^{\circ} C\\\\=-10\ K$

So,

$Q=15\times 4.184\times -10\\\\Q=-627.6\ J$

Hence, 627.6 J of heat is released and negative sign shows that energy is being given off.

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