RAL CHEMISTRY SUBTEST- PART A 9. What is the molar mass of magnesium hydroxide,

Question

RAL CHEMISTRY SUBTEST- PART A 9. What is the molar mass of magnesium hydroxide, 1. Mg(OH)2, a common antacid? (A) 58 g/mol (C) 42 g/mol (B) 56 g/mol (D) 41 g/mol 10 , The average density of blood is 1.060 kg/L. The avera man body contains 5.00 L of blood. What is the averag (A) 5.30 kg (C) 3.94 kg e mass of blood in the human body? (B) 4.72 kg (D) 0.212 kg 3· The combustion of ethanol with oxygen forms carbon dioxide and er. CH,CH20 ) +-02(g) CO2(g) +-H20(1) When this reaction is balanced the coefficients in order are: (A) 1, 2, 3, 3 (C) 1, 3, 2, 3 (B) 3, 3, 2, 1 (D) 1,3,3,2 4. What is the approximate density of an average human? (A) 120 g/mL (C) 70 g/mL (B) 1 g/mL (D) 0.00006 g/mL

Explanation / Answer

1. Molar mass of Mg(OH)2 is 58 g/mol

2. Mass = Density × Volume = 1.060 × 5.00 = 5.30 Kg

3. C2H5OH + 3O2 = 2CO2 + 3H2O

4. Approx density of an average human = 1 g/ mL

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