Question

8.Consider the compound 3C6H12O6. The simpest ratio of molecules to carbon atoms to hydrogen atom are:

a)3:6:6

b)1:6:12

c)1:2:6

20. Reacting Aluminum metal with copper (II) sulfate results in 2Al+3CuSO4----> Al2(SO4)3+3Cu. If i have 0.45 moles of copper produced from this reaction the number of moles of aluminum needed starting reagent is

a)0.45 moles Al

b)0.3 moles Al

C)0.225 moles Al

Answer 1

8.Consider the compound 3 C6H12O6. The simpest ratio of molecules to carbon atoms to hydrogen atom are:

a)3:6:6

b)1:6:12

c)1:2:6

if the molecular formula of the compound is 3C6H12O6 than the simpest ratio of molecules to carbon atoms to hydrogen atom is b)1:6:12

means in a mole of C6H12O6 there are 6 atoms of C and 12 atoms of H.

20. Reacting Aluminum metal with copper (II) sulfate results in 2Al+3CuSO4----> Al2(SO4)3+3Cu. If i have 0.45 moles of copper produced from this reaction the number of moles of aluminum needed starting reagent is

a)0.45 moles Al

b)0.3 moles Al

C)0.225 moles Al

2Al+3CuSO4----> Al2(SO4)3+3Cu.

2 mol Al / 3 mol Cu * 0.45 mol Cu = 0.3 mol Al

Thus the correct answer is b) 0.3 moles Al