Question

Perform each conversion between energy units.

part a.

2.57×10⁶ kJ to kcal

Express the value in kilocalories to three significant figures.

part b.

6.51×10³ kJ  to kW⋅h

Express the value in kilowatt-hours to three significant figures.

part c.

3.26×10⁴ J  to Cal

Express the value in Calories to three significant figures.

Answer 1

One joule equals 4.186 calories.

One joule equals 0.000278 kW-h.

Part a k cal 2.57x 106 kJ a stx 106 kJ 1 kJ 4.186k Cal 2.5t x 106 X4 186 k cal 1140 35 k cal - 114 xID k Cal (dtos b Part b 6-51X 103 kJ= kw-h 6.51x103 kJ 1tJ= 0-000a78 kw-h -6.51x 103 x O.000a18 kw -h z 0-1864 kw-h 0.186 Ew-h (dwue S b) Part C. 3.a6x 104 J Cal 3.26 x 104 J 1J .186 Cal 3-a6x 104 x 4.186 Cal 1419 a & Cal 14a x 10 Cal