# Exercise 1C

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Solutions, hints and answers can be found in the Solutions Page. It is strongly recommended that students do not look at the solutions until after completing or attempting to complete the problems. Going straight to the solutions will reduce the point of the exercises.

## 3.1

Give systematic names for the compounds or write the formula for the given names of the compounds.

1. $$HgO$$
2. $$FeI_3$$
3. $$SiCl_4$$
4. $$NO_2$$
5. tin(II) nitride
6. copper(II) oxide
7. mercury (I) oxide
8. sodium dichromate

## 3.2

ASSIGN the CORRECT IONIC formula for each of the following compounds:

1. sodium chloride
2. tin(II) fluoride
3. magnesium nitride
4. aluminum oxide
5. mercury(I) sulfide
6. silver bromide

## 3.3

State the name of the following compounds.

1. $$HgO$$
2. $$HNO_2$$
3. $$HClO_3$$
4. $$KCl$$
5. $$OF_2$$
6. $$LiMnO_4$$
7. $$CaS_2O_3$$
8. $$Fe_2O_3$$
9. $$CO$$
10. $$SO_4$$
11. $$NaOH$$
12. $$HCN$$

## 3.4

Give names of the following ions or acids.

1. $$CIO^-$$
2. $$ClO_2^-$$
3. $$ClO_3^-$$
4. $$ClO_4^-$$
5. $$HClO$$
6. $$HClO_2$$
7. $$HClO_3$$
8. $$HClO_4$$

## 3.5

There are some chemical stuffs that are unlabeled in a chemistry lab. Please write down the formula for each of the followings for the students:

1. nickel(II) iodide
2. aluminum perchlorate
3. ammonia
4. magnesium dichromate
5. ammonium phosphate
6. xenon tatrafluoride

## 3.6

Write the molecular formula for all of the following COMPOUNDS:

1. Barium Chlorate
2. Carbon monoxide
3. Carbon dioxide
4. Carbon Tetrachloride
5. Germanium (IV) Sulfide
6. Germanium (II) Sulfide
7. Lithium Bromide

## 3.7

Give the chemical formula for each compound name:

1. lithium nitrite
2. antimony (III) sulfide
3. cobalt (III) hydroxide
4. tin (IV) iodide
5. perchloric acid
6. nickel (II) nitride
7. dinitrogen pentoxide
8. hydrofluoric acid
9. iron (III) oxide

## 3.8

Why is $$Na_2 CrO_4$$ called Sodium Chromate and why is $$SnCrO_4$$ called Tin(II) Chromate ?

## 3.9

Give the systematic names of the substances indicated by the molecular formulas below :

1. $$CaCO_3$$
2. $$NH_4Cl$$
3. $$BaSO_3$$
4. $$Li_3PO_4$$
5. $$NaOH$$

## 3.10

Give the molecular formula of the compounds indicated below:

1. Magnesium Hydroxide
2. Sodium Nitrate
3. Acetic Acid
4. Silicon Tetrachloride
5. Magnesium Sulfate

## 3.11

What are the empirical formula mass and molar mass of $$H_2O_2$$? What is the relationship between them?

## 3.12

 Compounds $$CH_5N$$ $$C_2H_6O_2$$ $$H_2SO_4$$ $$CH_3COCl$$ Mass(g) 157.5 # of Mole 1.404 # of Molecules $$4.022 \times 10^{23}$$ Total # of Atoms $$1.356 \times 10^{25}$$

## 3.13

Ethylene glycol is a raw material in the manufacture of polyester fibers. It only contains hydrogen, carbon and oxygen. Their percentages are 9.763% H, 38.70% C and 51.55% O by mass. If the molar mass of ethylene glycol is 62.07 g/mol, what is the molecular formula of ethylene glycol? If the molecular formula is different from its empirical formula, please write its empirical formula.

## 3.14

A 5.00 g sample of an unknown compound with 82.14 g/mol is completely burned to give 16.08 g of carbon dioxide and 5.48 g of water. What is the empirical formula of this compound?

## 3.15

Glycerol is a sugar alcohol compound composed of only carbon, hydrogen, and oxygen. It is commonly used in pharmaceutical and food industry. Combustion of 1.79 grams of glycerol yields 2.57 g CO2 and 1.40 g $$H_2O$$. Find the empirical formula of glycerol.

## 3.16

Find the mass percent composition of the following molecules.

1. $$C_3H_8$$
2. $$CHCl_3$$
3. $$(C_2H_5)_2O$$

## 3.17

Ethylene glycol is a raw material in the manufacture of polyester fibers. It only contains hydrogen, carbon and oxygen. Their percentages are 9.763% H, 38.70% C and 51.55% O. If the molar mass of ethylene glycol is 62.07 g/mol, what is the molecular formula of ethylene glycol? If the molecular formula is different from its empirical formula, please write its empirical formula.

## 3.18

Indicate the oxidation state of the element assigned in the compounds below:

1. $$C$$ in $$CO_2$$
2. $$S$$ in $$CaSO_4$$
3. $$Sn$$ in $$SnO_2$$
4. $$Cd$$ in $$Cd$$
5. $$Co$$ in $$CoCl_2$$

## 3.19

Indicate the oxidation state for each atom in the compound below:

1. $$CaMgO_2$$
2. $$SeF_6$$
3. $$HNO_3$$
4. $$As_2O_3$$
5. $$LiMnO_4$$
6. $$PF_5$$
7. $$H_2SF_6$$
8. $$K_2Cr_2O_7$$
9. $$C_6H_{12}O_6$$
10. $$NH_4OH$$

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