A 0.1375-g sample of solid magnesium is burned in a bomb calorimeter that has a heat capacity of 3024 J/°C. The calorimeter contains exactly 300 g of water. As a result of the reaction, temperatures of the water and the calorimeter increase by 1.126°C. Calculate the heat given off by the burning of Mg in kJ/mol.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

the answer is na (sodium)

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3