How much energy is required to vaporize 2 kg of copper? Use the table below
and this equation: Q = mLvapor
Latent ne
Substance
Latent Hear Melting
Fusion
(°C)
(kJ/kg)
(melting)
Point
Vaporization
(boiling) (kJ/kg)
Boiling
Point
(°C
Aluminum
Copper
400660
207 1083
628 1063
2450
2566
2808
Gold
Helium
-269
Lead
1751
Mercury
Water
1981

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.