Question

5. What is the molecular weight (molar mass)of the common antacid calcium carbonate CaCO3? A) 100.9 gimol B) 48.08 g/mol C) 17.0 g/'mol D) 4.00 x 102 g/mol E) 2.50 x 10 g/mol 6. Calculate the molar mass of rubidium carbonate, Rb CO A) 340.43 g/mol B) 255.00 g/mol C) 230.94 g/mol D) 145.47 gmol E) 113.48 g/mol 7. Balance the following equation: B) Cai(РО.h@ + 3SiOts) + 14C(s) 3CaSiOds) + į4COg) + Pa(s) -> 8. How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides) are needed to form 485 g of sulfur tetrafluoride? 3SC140 + 4NaF(s) SF.(g) → s.cl() + + 4NaCI(s) A) 1940 g B) 1510 g C) 754 g D) 205 g E) 51.3 g Which of the following ions occurs commonly? 9. A) N3 D) Ca E) CI Page 2

Answer 1

Answers are:-

1. b

2. b

3. b

4. a

5. a

6. b

7. d

8. c

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