1. How much heat, in joules and in calories, must be added to a 75.3 g chromium block with a specific heat of 0.450 J/g·°C to increase its temperature from 25°C to its melting temperature of 1907°C? J = cal =
1. How much heat, in joules and in calories, must be added to a 75.3 g chromium block with a specific heat of 0.450 J/g·°C to increase its temperature from 25°C to its melting temperature of 1907°C? J = cal =
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 6E: How much heat, in joules and in calories, must be added to a 75.0g iron block with a specific heat...
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1. How much heat, in joules and in calories, must be added to a 75.3 g chromium block with a specific heat of 0.450 J/g·°C to increase its temperature from 25°C to its melting temperature of 1907°C?
J = cal =
2. A piece of unknown substance weighs 45.9 g and requires 2730 J to increase its temperature from 23.1°C to 88.9°C.
(a) What is the specific heat (in J/g·°C) of the substance?
J/g·°C
(b) If it is one of the substances found in the table below, what is its likely identity?
Specific Heats of Common Substances at 25°C and 1 bar
| Substance | Symbol (state) | Specific Heat (J/g·°C) |
|---|---|---|
| gold | Au(s) | 0.129 |
| copper | Cu(s) | 0.384 |
| iron | Fe(s) | 0.449 |
| argon | Ar(g) | 0.521 |
| silicon | Si(s) | 0.712 |
| carbon dioxide | CO2(g) | 0.843 |
| aluminum | Al(s) | 0.904 |
| nitrogen | N2(g) | 1.039 |
| water | H2O(l) | 4.1801 |
| helium | He(g) | 5.196 |
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