Posted by admin | Posted in Wedding accessories | Posted on 18-02-2003
Tags: via:packrati.us
CHEMISTRY!!! HELP ME I’M SO LOST!!!!!?
1. If the temperature of 32.3 g of ethanol increases from 25.1°C to 78.9°C, how much heat has been absorbed by the ethanol?
= J
2. A 4.90 g nugget of pure gold absorbed 260 J of heat. What was the final temperature of the gold if the initial temperature was 26.0°C? The specific heat of gold is 0.129 J/(g·°C).
=°C
3. What is the specific heat of an unknown substance if a 2.37 g sample releases 11.9 cal as its temperature changes from 24.1°C to 21.1°C?
= J/(g · oC)
1.
H = mass x T change x specific heat capacity = m x dT x c
H = 32.3 g x (78.9 – 25.1)C x 2.24 J/gC = 3890 J
2.
H = m x dT x c
dT = H / (m x c) = 260 J / (4.90 g x 0.129 J/gC) = 411 C
Final T = 26.0 + 411 = 437 C
3.
H = m x dT x c
c = H / (m x dT) = 11.9 cal / (2.37 g x 3.0 C) = 1.67 cal/gC
1 cal = 4.18 J
1.67 cal/gC x (4.18 J / 1 cal) = 7.0 J/gC
Specific heat value for ethanol taken from:
http://en.wikipedia.org/wiki/Specific_heat_capacity
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