How many moles are in 5.60 x 1025 molecules of Calcium carbonate?

93 moles

Explanation:

1 mole of CaCO_3 will have 6.022×10^(23) molecules of CaCO_3 .

Given number of molecules of Calcium carbonate =  5.60 x 10^(25)

Therefore, number of moles n =

n= 93 moles

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

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"