trying to get this tow qustions Q:1 the power ratings of microwave ovens are lis
ID: 491191 • Letter: T
Question
trying to get this tow qustions
Q:1
the power ratings of microwave ovens are listed in watts (1 watt = 1 J/s). How many seconds will it take a microwave oven rated at 1000 watts to warm 862 mL of soup from 33°C to 70.°C? Assume that the heat capacity and the density of the soup are the same as that of pure water.
Q2:
When 10.00 mL of a solution of strong acid is mixed with 100.00 mL of a solution of weak base in a coffee-cup calorimeter, the temperature rises from 21.4 oC to 26.3 oC. Determine q for the acid-base reaction, assuming that the liquids have densities of 1.00 g/mL and the same heat capacities as pure water.
Explanation / Answer
Q1)
mass of water = 862 mL x 1 g/ml
= 862 g
specific heat of soup = 4.184 J/g C
temperature rise = 70.°C - 33°C = 37 oC
Q = m Cp dT
= 862 x 4.184 x 37
= 133444.5 J
power rating of microwave oven = 1000 watts
1sec -------------> 1000 J
?? ----------------> 133444.5 J
time taken = 133.4 sec
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