Question

a) If 8.40 kJ of heat is needed to raise the temperature of a sample of metal from 15 degrees Celsius to 20 degrees Celsius, how many kJ of heat will be required to raise the temperature of the same sample of metal from 25 degrees Celsius to 45 degrees Celsius? b) Convert the following numbers: i. 57.2 kcal into kJ ii. 1.41 * 10^3 cal into J iii. 52.61 kJ into cal

Name: 1a if 840 kj of heat is needed to raise the temperature of a sample of metal from 15 degrees celcius to 20 degrees celcius how many kj of heat will be required to raise the temperature of th 36157
Uploaded: 2022-05-06T18:18:45-08:00
Duration: 3 min 34 s
Channel: Sri K
Description: 1a if 840 kj of heat is needed to raise the temperature of a sample of metal from 15 degrees celcius to 20 degrees celcius how many kj of heat will be required to raise the temperature of th 36157

          a) If 8.40 kJ of heat is needed to raise the temperature of a sample of metal from 15 degrees Celsius to 20 degrees Celsius, how many kJ of heat will be required to raise the temperature of the same sample of metal from 25 degrees Celsius to 45 degrees Celsius?
b) Convert the following numbers:
i. 57.2 kcal into kJ
ii. 1.41 * 10^3 cal into J
iii. 52.61 kJ into cal

Added by Bego-A B.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Sri K

05/06/2022

Step 1

Given: Heat required to raise temperature from 15°C to 20°C = 8.40 kJ Initial temperature (T1) = 25°C = 25 + 273 = 298 K Final temperature (T2) = 45°C = 45 + 273 = 318 K Using the formula Q = mcΔT, where Q is the heat, m is the mass, c is the specific heat Show more…

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a) If 8.40 kJ of heat is needed to raise the temperature of a sample of metal from 15 degrees Celsius to 20 degrees Celsius, how many kJ of heat will be required to raise the temperature of the same sample of metal from 25 degrees Celsius to 45 degrees Celsius? b) Convert the following numbers: i. 57.2 kcal into kJ ii. 1.41 * 10^3 cal into J iii. 52.61 kJ into cal