thermometer insulated. container A sample of brass, which has a specific heat capacity of 0.375 J.g¹.C¹, is put into a calorimeter (see sketch at right) that contains 250.0 g of water. The brass sample starts off at 96.7 °C and the temperature of the water starts off at 20.0 °C. When the temperature of the water stops changing it's 21.4 °C. The pressure remains constant at 1 atm. water Calculate the mass of the brass sample. Be sure your answer is rounded to 2 significant digits. g S X 2. sample a calorimeter

When calcium carbonate, CaCO3 (the major constituent of limestone and seashells), is heated, it decomposes to calcium oxide (quicklime). CaCO3(s)CaO(s)+CO2(g);H=177.9kJ How much heat is required to decompose 21.3 g of calcium carbonate?

How much heat is absorbed by a 44.7-g piece of leadwhen its temperature increases by 65.4°C?

A sample of sucrose, C12H22O11, is contaminated by sodium chloride. When the contaminated sample is burned in a bomb calorimeter, sodium chloride does not burn. What is the percentage of sucrose in the sample if a temperature increase of 1.67C is observed when 3.000 g of the sample are burned in the calorimeter? Sucrose gives off 5.64103kJ/mol when burned. The heat capacity of the calorimeter and water is 22.51 kJ/C.

Explain the difference between heat capacity and specific heat of a substance.

A 110.-g sample of copper (specific heat capacity = 0.20 J/C g) is heated to 82.4C and then placed in a container of water at 22.3C. The final temperature of the water and copper is 24.9C. What is the mass of the water in the container, assuming that all the heat lost by the copper is gained by the water?

The Group 2A carbonates decompose when heated. For example, MgCO3(s)MgO(s)+CO2(g) Use enthalpies of formation (see Appendix C) and calculate the heat required to decompose 10.0 g of magnesium carbonate.

Metallurgy A 25.0-g bolt made of an alloy absorbed250 J of heat as its temperature changed from 25.0°C to78.0°C. What is the specific heat of the alloy?

Given the following (hypothetical) thermochemical equations: A+B2C;H=447kJA+3D2E;H=484kJ2D+B2F;H=429kJ Calculate H, in kJ, for the equation 4E+5B4C+6F

A piston performs work of 210. L atm on the surroundings, while the cylinder in which it is placed expands from 10. L to 25 L. At the same time, 45 J of heat is transferred from the surroundings to the system. Against what pressure was the piston working?