University of Nizwa
Department of Biological Sciences & Chemistry
CHEM Name______ ID:______1003 / Exam 1

CHEM107
Assignment 2

Spring 2017

1. Name the following ions:

a) CN- ______

b) CO32- ______

c) SO42- ______

d) PO43- ______

e) MnO4- ______

2. Give the formula and the correct charge for each of the following:

a) perchlorate ______

b) sulfide ______

c) nitrate ______

d) dichromate ______

e) hydroxide ______

3. Name each of the following:

a) CCl4

b) Ag2SO3

c) P4O10

d) CaO

e) NH4F

f) CrI3

g) ZnF2

h) NH3

i) SO3

j) FeCl2•2H2O

4. Give the formula for each of the following:

cobalt(II) chloride -

beryllium(II) oxide -

arsenic trichloride -

magnesium chloride -

chromium(III) oxide -

tetrasulfur triphosphide -

gold(III) cyanide -

manganese(II) sulfate -

cupric carbonate –

calcium nitrite -

5. How many moles of O is in 4.5 moles of P2O5?

6. How many O atoms are in 3 moles of CO2?

7. How many moles of C would you have if you have 8.4 x 1024 atoms of C?

8. What is the mass of 5.64 mol of Mo?

9. Give the empirical formula for each of the following:

a) P4O10

b) Mn2(CO)10

c) Hg2O2

d) C4H10

e) Fe3(PO4)2

10. What is the percent composition of Ru2(CO3)3?

11. Determine the molecular mass for each of the following:
Circle your answer.

a) (NH4)2C2O4 b) Al(OH)3

12. Determine the empirical formula for a compound from the information given: The compound analyzes as 49.99 % C, 5.61 % H, and 44.40 % O. (10 points)

13. Balance the following equations by inspection. (20 points)

_____ La2O3 + _____ H2O ------> _____ La(OH)3

_____ Pb(NO3)2 + _____ H3AsO4 ------> _____ PbHAsO4 + _____ HNO3

_____ PCl5 + _____ H2O ------> _____ H3PO4 + _____ HCl

_____ Cu + _____ AgNO3 ------> _____ Cu(NO3)2 + _____ Ag

_____ HCl + _____ Mg3N2 ------> _____ NH4Cl + _____ MgCl2

14. Use the periodic table to find the numbers of protons, neutrons, and electrons for atoms of the following elements.

Name of Element or Ion / Element Or Ion Symbol / Mass Number / Atomic
Number / Protons / Neutrons / Electrons
Boron / B / 11 / 5 / 5 / 6 / 5
Sodium / 24 / 11
Y / 89 / 39
Copper (I) / 29 / 35
Tc / 98 / 43
Pb / 207
Thallium / 204 / 81
H / 0
Carbon / 12
N / 7
Ba2+ / 56
Calcium ion
Si / 14
Argon / 18
Mg / 12 / 12

15. Given the following equation:

H2SO4 + 2 NaOH ------> Na2SO4 + 2 H2O

a)  If 49.0 g of H2SO4 is reacted with 20.0 g of NaOH, determine the limiting reagent

b)  Determine the number of moles of H2O produced

c)  Determine the number of grams of Na2SO4 produced

d)  Determine the number of grams of excess reagent left over in the reaction

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