What mass of this substance must evaporate to freeze 170 g of water initially at 25°C? (The heat of fusion of water is 334 J/g; the specific heat of water is 4.18 J/(g-K).) Express the mass in grams to two significant digits.

Calculate the amount of heat needed to melt 95.2 g of solid benzene (CH) and bring it to a temperature of 17.7 °C. Be sure your answer has a unit symbol and the correct number of significant digits. ☐ x10 X

Dr. Lussier enjoys a bath after a long day. After filling his tub with exactly 216.0 L of hot water, he finds that the initial temperature is 63.3°C - which is far too hot. If he would like his bath to be 34.2°C, how many kilograms of ice at exactly 0.00°C must he add? Assume: The density of water is O.991 g mL-1, Cwater = 4.18 J g-1 °C•1, and AfusH° (ice) = 6.02 kJ mol1, molar mass water: 18.02 g mol-1 %3D

How much ice in grams would have to melt to lower the temperature of 342  mL  of water from 45  ∘C  to 0  ∘C ? (Assume that the density of water is 1.0  g/mL .)        Express your answer using two significant figures.

A)   An iron nail with a mass of 12 gg absorbs 15 J of heat. If the nail was initially at 30 ∘C, what is its final temperature? Express your answer using two significant figures. B) When 47.1 J of heat is added to 13.8 g of a liquid, its temperature rises by 1.74 ∘C. What is the heat capacity of the liquid?

Calculate the amount of heat needed to boil 115. g of acetic acid (HCH,CO,), beginning from a temperature of 33.9 °C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol. x10

Calculate the amount of heat needed to melt 140. g of ice (H₂O) and bring it to a temperature of 23.2 °C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol. □ x10 X

While heating two different samples of water at sea level, one boils at 102°C and one boils at 99.2°C. Calculate the percent error for each sample from the theoretical 100.0°C.

Calculate the amount of heat needed to boil 108. g of octane (C,H13), beginning from a temperature of - 52.6 °C. Round your answer to 3 significant digits. Also, be sure your answer contains a unit symbol.

14.0 g of cream at 20.3 °C are added to an insulated cup containing 100.0 g of coffee at 78.8 °C. Calculate the equilibrium temperature of the coffee. You may assume no heat is lost to the cup or surroundings, and that any physical properties of cream and coffee you need are the same as those of water. Be sure your answer has 3 significant digits. [°C x10 X S