Answer: 3.99g
Explanation:
Specific heat capacity (c) is defined as the quantity of heat required to raise the temperature of an object/ a body by 1kelvin.
Mathematically, Q = mc∆t where;
Q is the quantity of heat absorbed
m is the mass of the object
c is the specific heat capacity
∆t is the change in temperature = final temperature - initial temperature.
Given Q = 900Joules, c =0.902J/gK ∆t = 38°C - 30°C = 8°C = 8°C+273 = 281Kelvin
m is the unknown
Substituting this values in the given formula to get m we have;
m = Q/c∆t
m = 900/0.802(281)
m = 900/225.362
m = 3.99g
Mass of aluminum used is 3.99g
