Test 2

Questions

1)Name the following compounds

a) N₂O₃

b) CBr₄

c) Co(NO₃)₃

d) HI

e) HNO₃

f) P₂Cl₄

g) B₂O₃

h) K₂CrO₄

i) Co₂(SO₄)₃

j) HCl

k) H₂SO₄

2) Using Avogadro’s number (6.022×10²³ atoms/mole) and molar mass concepts answer the following:

a) How many moles are present in 86.2 grams of Na?

b) What is the mass in grams of 55.56 moles of Be?

c) How many atoms are present in 1.2 moles of Li?

d) How man moles are present in 3.7 grams of CO₂?

Answers

1) Name the flowing compounds:

a. dinitrogen trioxide

b. carbon tetrabromide

c. cobalt (III) nitrate

d. hydroiodic acid

e. nitric acid

f. diphosphorus tetrachloride

g. diboron trioxide

h. Potassium chromate

i. cobalt (III) sulfate

j. hydrochloric acid

k. sulfuric acid

2) Using Avogadro’s number (6.022×10²³ atoms/mole) and molar mass concepts answer the following:

a) 86.2 grams Na x (1 mol/22.98 g) = 3.75 moles

b) 55.56 mol Be x (9.01 g/1mol) = 500.6 g Be

c) 1.2 mol x (6.022×10²³ atom/1 mol) = 7.2 x 10²³ atoms

d) 3.7 grams of CO₂ x (1 mol CO₂ /44.01 g) = 0.084 mol CO₂