Which chemical reaction is not properly balanced? 10 HNO_3 + F_2 rightarrow 10 N

Question

Which chemical reaction is not properly balanced? 10 HNO_3 + F_2 rightarrow 10 NO_2 + 2HFO_3 + 5 H_2O 4 NH_3 + Cl_2 rightarrow N_2H_4 + 2NH_4 Cl 2 N_2 + 6 H_2O rightarrow 4NH_3 + 3 O_2 FeCl_2 + 2 KBr rightarrow FeBr_2 + 2 KCl all of the reactions are correctly balanced How many chlorine atoms are there in 3.0 moles of phosphorus pentachloride? 3.61 times 10^23 6.02 times 10^23 3.01 times 10^24 9.03 times 10^24 1.08 times 10^25 Consider the following reaction for the next three questions: 8 Al + 3 Fe_3O_4 rightarrow 4 Al_2 O_3 + 9 Fe How many moles of Al_2O_3 can be formed from 5.0 mol Al and excess Fe_3O_4? 1.3 mol 2.5 mol 4.0 mol 10. mol 20. mol How many moles of Fe can be formed from 3.0 mol Fe_3O_4? (assume that plenty of Al metal 1.0 mol 3.0 mol 6.0 mol 9.0 mol 18 mol If excess aluminum is available, how many grams of Al_2O_3 are formed from 0.25 grams 0.15 g 0.42 g 0.75 g 0.080 g

Explanation / Answer

Q19

which is not balanced? simply compare atoms of each...

a is balanced

b is balanced

c is balanced

d is also balanced

the answer must be then "E"

Q20

chlorine atoms in 3 mol of PCl5

1 mol = 5 mol of Cl

so..

3 mol = 15 mol of Cl

1 mol = 6.022*10^23 atoms

so 15 mol = 15* 6.022*10^23 atoms = 9.033*10^24 atoms of Cl in 3 mol of PCl5

Q21

relate Al and Al2O3... ratio is 8:4 or 2:1

5 mol of Al should produced 5/2 = 2.5 mol of Al2O3

Q22

ratio is 3:9, so 1:3

3 mol --> will form 3*3 = 9 mol of Fe

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