questions 1 if one assumes that the specific heat of water doesn t cha

Question

Questions
1) If one assumes that the specific heat of water doesn't change with temperature, what result
would you expect for part C? Calculate your % error based on this value and comment on
possible sources of error.
[0.5]
9
2) At 100°C, the heat capacity of water is actually 4.2157 J/g °C. Calculate your % error based on this
value.
[0.5]/n3) Assume that the density of water is 0.998 g/mL. Calculate the amount of water lost to
evaporation when you heated the water in part C.
[1]
4) Would having some of the water splash out when the metal was dropped into the
calorimeter erroneously increase or erroneously decrease the reported specific heat? Explain. [1]
5) There are 4,184 joules in a food Calorie (note the capital "C"). A 70.-gram serving of
Kraft® Macaroni and Cheese contains 16 grams of carbohydrate (4.0 Cal/g), 3.0 grams of fat (9.0
Cal/g), and 9.0 grams of protein (4.0 Cal/g). Calculate the temperature increase of 2.0 kg of water if
all of the food energy in 150.0 grams of Kraft Macaroni and Cheese goes entirely into heating
the water.
10/n6) When 49.834 grams of a metal at 100.0°C is added to 46.497 grams of water at 23.2°C,
the temperature of the water increases to 25.6°C. If the metal comes from the list below, what is
the identity of the metal?
[1]
Metal specific heat
Be
0.436 cal/g °C
brass
0.092 cal/g °C
Au
0.030 cal/g °C
Ag
Mg
Fe
0.056 cal/g °C
0.243 cal/g °C
0.108 cal/g °C