How many atoms are present in 55 grams of iron
1 answer:
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Answer:
Time = t = 30.01 minutes
Explanation:
The missing part of the question is that "The water heater power rating is 255 Watts, where 1 Watt = 1 J/s.
Firstly, calculating the work done by water heater to heat 5.5 L of water from 23° C to 43°C.
Work Done = Q = m C ΔT
where,
Q = Heat Transfer
m = mass of water
m = Density x Volume = 1 g/mL x 5.5 L = 1000g/L x 5.5L = 5500 g
ΔT = Temperature Difference = 43-23 = 20°C
C = Heat Capacity of Water = 4.186 J/g °C
Therefore,
Since, Power can be given as Work done per unit time,
or, in this case,
Here,
P = 255W or P = 255J (Since 1W = 1J)
The heat will be evolved in following process:
1) cooling steam from to
= Q1
2) conversion of steam to water =Q2
3) Cooling of water to to
=Q5
Let us calculate each energy one by one:
1) Q1:
Mass of water vapour = moles X molar mass = 1mol X 18 = 18 grams
heat capacity of steam is
2) Q2:
for this we need heat of vaporisation of water = -40.7kJ/mol
so the heat evolved in conversion of stem to water is -40.7kJ
3) Q3
the specific heat of water is
heat evolved in cooling of water will be
4)Q4:
The heat of conversion of ice to water (melting) is 6.02kJ/mol
5) Q5
The cooling of ice will require
The total energy released is
The heat released will be 59.474 kJ