How much energy, in kJ, is required for 16 g of ammonia (NH3) to change from a liquid to a gas? The molar heat of vaporization of ammonia is 23.3 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

your parents i think this could be it

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a