Question
The temperature of 12.0 g of an unknown substance was raised approximatelx 150^circ C i J of heat energy was added. Identify the substance based on the experimental calculatio heat capacity. (A) glass B. aluminium e. iron A. copper
Solution
4.2
(231 Votes)
Allison
Professional · Tutor for 6 years
Answer
To identify the substance based on its specific heat capacity, we need to use the formula for calculating heat energy:
where:-
is the heat energy added (in joules),-
is the mass of the substance (in grams),-
is the specific heat capacity (in J/g°C),-
is the change in temperature (in °C).Given:-
-
We are not given the exact amount of heat energy (
), so let's assume a hypothetical value or that it was omitted by mistake. For this example, let's assume
as an arbitrary value for calculation purposes.Rearranging the formula to solve for the specific heat capacity (
):
Substitute the values:
Now, compare this calculated specific heat capacity with the known specific heat capacities of the substances:- Glass: approximately 0.84 J/g°C- Aluminium: approximately 0.897 J/g°C- Iron: approximately 0.450 J/g°C- Copper: approximately 0.385 J/g°CBased on the approximate calculation, the closest match to 1.0 J/g°C would be glass. Therefore, the substance is most likely:(A) glass