Chemistry 101 HW Help Complete and balance binary ionic compounds 6. Complete an

Question

Chemistry 101 HW Help Complete and balance binary ionic compounds

6. Complete and balance each of the following decompisition reaction

* Li2CO3
* CdCO3

7. Write a balanced equation for the single replacement reaction for
* copper wire placed in an aluminum nitrate solution
* Silver wire placed in cadmium nitrate solution

8. Allose is a sugar with a molar mass of 180 g/mol. If the percent compostition is 40.0% C, 6.72% H, 53.3% O, what is the molecular forumla for allose.

9. What is the mass of rust, Fe2O3, that contains 10.0 g of iron?

10. In an experiment 0.500 g of nickel reacted with air to give 0.704 g of nickel oxide. What is the empirical formula for nickel oxide?

Explanation / Answer

6.

Li2CO3 --> CO2 +Li2O

CdCO3 --> CdO + CO2

7.

3Cu + 2Al(NO3)3 --> 2Al + 3Cu(NO3)2

2Ag + Cd(NO3)2 --> 2AgNO3 + Cd

8. C6H12O6

9. MW of Fe2O3 = 159.69 g/mol

Percentage of Fe in Fe2O3 =111.69/159.69 X 100 = 69.9 %

If M is the total weight of the rust,

       10 =.699 x M

       M= 14.306 g

10.

Ni + O2 --> nickel oxide

0.5 g --> .704 g

0.00851 mol --> 0.00942 mol

1 mol --> 0.00942/0.00851 mol

1 mol --> 1.10 mol

Therefore empirical formula is NiO (rounding to nearest whole number)

(Molecular weights are Ni - 58.69, O2 - 32, NiO - 74.69)

ThereforeNiO1.106

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