How many joules of energy are required to raise the temperature of 130 g of gold from 15.0°C to 85°C?
_____J
2007-05-16 04:06:25 · 4 answers · asked by Emma 1 in Science & Mathematics ➔ Physics
Q=Cp m (T2-T1)
Q- heat (in Joules if you like)
Cp specific heat capacity (of gold in your case)
m - mass (of gold)
T2- final temperature
T1- initial temperature
For gold Cp = 0.1291 Joules/ (g K)
Q= (0.1291) x 130 (85.0 - 15.0)=
Q=1175 Joules
(Note that the difference between deg K and deg C is the same.)
2007-05-16 04:09:39 · answer #1 · answered by Edward 7 · 2⤊ 0⤋
Heat= heat capacity x temperature change
Heat= M c(specific heat of gold)x delta(t)
Heat =130 gr c (85-15) calorie
Heat =130 c 70 cal
Heat =9100 c cal,,,,,,,,,,,,,,,,hint: 1 cal=4.2 joules
Heat=9100 c x 4.2 J =38220 c(gold) J
.
2007-05-16 11:17:13 · answer #2 · answered by Tuncay U 6 · 0⤊ 0⤋
Go look up the specific heat of gold. It is measured in joules per gram degree centigrade.
Then multiply that by the mass and change in temperature to get your energy.
Sometimes they give you specific heat in joules per mole degree centigrade. In that case, you have to use the atomic weight to convert from grams to moles.
2007-05-16 11:11:44 · answer #3 · answered by Anonymous · 0⤊ 2⤋
u hav not specified the specific heat of gold ... the formulae to calc the answer is m*S*T
m=mass in kgs
t=temperature rise
2007-05-16 11:10:35 · answer #4 · answered by krzee 1 · 0⤊ 1⤋