Calorimetry Questions and Answers

Suppose 24 kg of 90.5° C water is placed in contact with 24 kg of 9.5° C water. 33% Part (a) What is the energy change, in joules, in the hot water due to the transfer of heat? A33% Part (b) How much work could a Carnot engine do with this heat transfer, assuming it operates between two reservoirs at constant temperatures of 90.5°C and 9.5°C? 33% Part (c) What increase in entropy (in joules per kelvin) is produced by mixing 24 kg of 90.5° C water with 24kg of 9.5° C water?

You have equal masses of two different substances, A and B. Initially substance A starts at 90.1°C and substance B starts at 30.2°C. You place them in a well-insulated container of negligible mass and allow them to reach thermal equilibrium. If the equilibrium temperature is 79.4°C, which substance has the larger specific heat? The specific heats are identical. substance B More information is required. substance A

The volume of a substance, A, measured in cubic centimeters increases according to the exponential growth dA 0.3A, where t is measured in hours. The volume of another substance, B, also measured in cubic dt centimeters increases at a constant rate of 1 cm³ per hour according to the linear model -=1. Att = 0, model dB dt substance A has a volume A(0) = 3 and substance B has size B(0) = 5. At what time will both substances have the same volume? (1 point) 0.8614 hours O 0.9776 hours 3.0303 hours 3.4531 hours

A 65.0 g piece of iron at 525° C is put into 635 grams of water at 15.0° C. What is the final temperature of the water and the iron? (Cwater = 4186 J/kg°C, Ciron = 412 J/kg°C) Select one: a. 50.1°C b. 9.8°C c. 30.5°C d. 20.1°C

You have 1 kg of water and you want to use that to melt 0.1 kg of ice. What is the minimum temperature necessary in the water, to just barely melt all of the ice? (L₁ = 3.33 x 105 J/kg, Cwater 4186 J/kg°C) Select one: a. 80°C b. 18°C c. 8°C d. 100°C

An ice cube (T=0 °C) is added to a 50 g aluminum cup containing 400 g of water initially at 18°C. If the resulting temperature of the cooled water is 15°C, what was the mass of the ice cube?

Excited about the success of celebrity stamps, post office officials were rumored to have put forth a plan to institute two new types of thermometers. On these new scales, °E represents degrees Elvis and M represents degrees Madonna. If it is known that 50°E=25°M, 330°E = 125°M, and degrees Elvis is linearly related to degrees Madonna, write an equation expressing E in terms of M

If a cold spoon is placed into a mug of hot coffee, which of the following correctly describes what happens? A. The cold spoon decreases in temperature, and the hot coffee decreases in temperature. B. The cold spoon decreases in temperature, and the hot coffee increases in temperature. C. The cold spoon increases in temperature, and the hot coffee decreases in temperature. D. The cold spoon increases in temperature, and the hot coffee increases in temperature.

When steam condenses 1. Only two of these occur. 2. All of these occur. 3. molecules move closer together. 4. it changes from the gas phase to the liquid phase. 5. Only one of these occurs. 6. it gives off heat.

In 2010 a well being drilled from the Deepwater Horizon platform in the Gulf of Mexico blew out, spilling some 5 million barrels of oil into the Gulf over 3 months. (a) Find the energy equivalent of the spilled oil, in joules or suitable multiples, and (b) estimate how long this oil could have supplied the entire U.S. energy demand.

Liquid nitrogen, which has a boiling point of 77 K, is commonly used to cool substances to low temperatures. How much energy must be removed from 1.0 kg of gaseous nitrogen at 77 K for it to completely liquefy? Assume the latent heat of liquid nitrogen is 2.01 x 10 J/kg. Answer in units of J.

Here you'll calculate the power output of a car in two ways: (1) using the fact that the car has a 250-horse- power engine and (2) krowing that the car gets 20 miles per gallon when traveling at 60 miles per hour. (a) Convert the horsepower rating into watts and (b) calculate the gasoline consumption rate and, using Table 3.3's energy equivalent for gasoline, convert the result to a power in watts. Comparison of your results shows that a car doesn't always achieve its engine's rated horsepower.

Years ago, a block of ice with a mass of about 23 kg was used daily in a home icebox. The temperature of the ice was 0.0°C when delivered. As it melted, how much heat did a block of ice that size absorb? The latent heat of fusion of water is 3.34 x 105 J/kg. Answer in units of J.

2.0 kg of liquid water is boiled at 100 °C and all of it is converted to steam. If the change of state takes place at the atmospheric pressure (1.01 x 10³ Pa), calculate i.the energy transferred to the system, ii.the work done by the system during this change, and iii.the change in the internal energy of the system. Given, the volume of 2 kg of water changes from 2.0 x 10³ m² in liquid form to 3.342 m' when in the form of steam.

If two small beakers of water, one at 60°C and one at 70°C, are mixed in a larger beaker, what is the final temperature of the water? less than 60°C the temperature will increase then decrease not enough information greater than 70°C between 60°C and 70°C exactly 65°C

The temperature scale where water boils at 212° is O Kelvin O Fahrenheit O Celsius

When 30g of ice at 0 degree C is mixed with m grams of water at 20C exactly half of the ice melted. Find a) The final temperature of the ice- water mixture in the thermal equilibrium. b) find the mass m in grams. Specific heat of water is 4,186 J/kg.C Latent heat of fusion for ice is 3.34 *10^5 J/kg

800 g of the ideal gas is contained in a rigid container of the volume V at 2 atm and 25 degrees C. If the number of molecules in the container is 12.044 × 10^23 (one mole of gas contains 6.022 x 10^23 molecules and 1atm = 1.01 x 10^5 Pa, 1L=10^-3 m^3) a) How many moles of the gas is there in the container? b) What is the volume V in L? c) What is the molar mass of the gas in grams? d) What is the mass of one molecule of the gass? e) If the pressure is decreased to 0.5 atm and half of the gas is released from the container what is the temperature of the gas in C?

Which of the following statements is true concerning temperature scales? a. Fahrenheit degrees are larger than Celsius degrees. b. Kelvins are larger than Celsius degrees. c. The Celsius scale is a relative scale. d. The Kelvin is one of the 7 base units of the SI unit system. e. Zero for the Celsius scale is the same temperature as zero for the Fahrenheit scale.

On a trip, you notice that a 3.50-kg bag of ice lasts an average of one day in your cooler. What is the average power in watts entering the ice if it starts at 0°C and completely melts to water (at 0°C) in exactly one day?