. wing conversions contains the correct number of significant 42 in Ihr_ = 0.415
ID: 543876 • Letter: #
Question
. wing conversions contains the correct number of significant 42 in Ihr_ = 0.4158 hr 60 min 12,0 ft ×12 in 240 kg × 220kg 254 cm I ft in 1 lb = 11 lb oblem Solving Questions 1) Calculate amount of heat released when 125 g of steam condenses and cools to liquid at 15° C. (heat of vaporization points) 2260 1/1 g H:0, specific heat of water is 4.184 J/g C)0 A dose of aspirin of 5.0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds. The number of milligrams of aspirin that should be administered is (1kg 2.2 lb)(10 points) 2)Explanation / Answer
Ans 1
Mass of steam = 125 g
Latent heat of condensation = - latent heat of vaporization
Steam condenses at 100 C
Heat released Q1 = m x latent heat of condensation
Q1 = 125 g x (-2260 J/g) = - 282500 J
Heat released to cool water from 100 c to 15 c
Q2 = m Cp (T2 - T1)
= 125 g x 4.184 J/g-C x (15 - 100) C
Q2 = - 44455 J
Total amount of heat released = Q1 + Q2
= -282500 - 44455 = - 326955 J
Negative sign shows the heat released
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