Chegg Study TEXTBOOK SOLUTIONS EXPERT ORA sionmasteringchemi

Chegg Study TEXTBOOK SOLUTIONS EXPERT ORA sion.masteringchemistry.com ) 11 of 46 Part A 353 Cal to kilowatt-hours Express your answer using three significant figures. kWh Submit Request Answer Part B 21 J to calories Express your answer using two significant figures.

Solution

1 Cal is 4.18 joules , so 353 calorie * 4.18/1000*3600 = 0.000408 kWh ,. And for second question 1 calorie is 4.18 joules ,so 21 joules is 5.2 calories