the heat fusion for zinc chloride is 40.4 calories per gram at the melting point of 275 Celsius. How much heat is required to melt 500 g of zinc chloride at its melting point.
a. 11.1 kcal
b. 1.80 cal
c. 12.4 cal
d. 20.2 kcal
could you please explain how you got the answer too.thanks a lot.
2007-11-19 04:17:04 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
500gZnCl2 x 40.4cal/1gZnCl2 = 20,200 cal
2007-11-19 04:22:13 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋
(40.4 calories / gram)(500. grams) (1.00 kilocalorie / 1000 calories) = 20.2 kilocalories
Answer: "d" (actually 20 kcal because only one significant figure in "500 g" )
2007-11-19 12:32:46 · answer #2 · answered by Dennis M 6 · 0⤊ 0⤋
I am the smartest person at my school and I am in first grade but got moved up to 7th it is c
2007-11-19 12:22:15 · answer #3 · answered by Anonymous · 0⤊ 0⤋
the answer is D.,500times40.4
2007-11-19 12:37:18 · answer #4 · answered by Faye P 1 · 0⤊ 0⤋