Copper has a specific heat of 0.385 J/(g×°C). A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 °C to 200 °C. What is the mass of the piece of copper?

Identify the number of bonding pairs and lone pairs of electrons in water (H2O).  

Calculate ∆E of a gas for a process in which the gas absorbs 60J of heat and does 17 J of work by expanding.

Gold has a specific heat of 0.129 J/(g×°C). How many joules of heat energy are required to raise the temperature of 15 grams of gold from 22 °C to 85°C?

Use a standard enthalpies of formation table to determine the change in enthalpy this reaction. CH4(g) + 2 O2(g) —> CO2(g) + 2 H2O(l)  Compound      Enthalpy value CH4 (g)                            -74.8 kJ/mol O2 (g)                                  0 kJ/mol CO2 (g)                                -393.5 kJ/mol H2O (l)                                 -285.8 kJ/mol

   How would you prepare a 0.5 M solution of sodium hydroxide? 

What is the main component of vinegar that is titrated?

Select all facts about titrations from the statements below.

 How many atoms are in 1 mole of calcium?   

  What is the total number of atoms contained in 2.11 moles of nickel?