Acertain chemical reaction releases of heat energy per mole of reactant consumed. suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). it takes of heat energy to raise the temperature of this calorimeter by . now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by . how would you calculate the number of moles of reactant that were consumed?

To relate the quantity of a substance to the amount of heat transferred and heat capacity, temperature, number of moles is given by

q=ncpΔT

where

n is number of moles

cp is molar heat capacity

ΔT=Tfinal−Tinitial is the temperature difference

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

the answer is b. dilution