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How many grams of NaCl is required prepare 200 mL of a solution of 1 M NaCl (Molar of mass of NaCl=58.44g/mol)?
200 ml of 1 M Nacl have Moles of NaCl = 200 × 1 / 1000 = 0.2 mole Mass of NaCl = moles of NaCl × Molar mass .Mass...
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Calculate the vapor pressure of salt solution containing 20 grams salt (NaCl) in 1.5 kg of water at 25°C? Note: P° water at 25°C is at 24 torr and molecular weight of NaCl is 58g/mol
Pa=XPa° = 83.3333 x 23.8/83,6751333= 23,7027806 torr.
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A 95.5 grams of sodium sulfate (Na₂SO₄)is dissolved in 1150 grams of distilled H2O. Calculate the molality of the Na₂SO₄ solution. Molar mass: Na = 23 g/mol ; S = 32 g/mol ; O = 16 g/mol
Molar mass of Na2SO4= 142.04 g/mol95.5/142.04= 0.6720.672mol/1.15kg= 0.585mol/Kg
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A compound with a molar mass of 544.0 g/mol is made up of 26.5 grams carbon, 2.94 grams Hydrogen and 70.6 grams Oxygen. What is its empirical and molecular formula?
Molar mass of Carbon = 12.01126.5/12.011=2.21molMolar mass of H=1.007842.94/1.00784=2.92Molar mass of O= 15.9970.6/15.99= 4.42CHO2
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2Na+Cl2→2NaCl When 10.0 g of Cl2 is used, the reaction produced 12.5 grams NaCl. What is the % yield of the reaction? Use the following molar masses: Cl2=70g/mol and NaCl=58g/mol.
2Na + Cl2 → 2NaClThe theoretical yield of the reaction:m(NaCl) = m(Cl2) × 2 Mr(NaCl) / Mr(Cl2) = 10.0 g × 2 × 58 g/mol / 70 g/mol = 16.6...
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The molecular mass of Aspirin is 180. Aspirin has a solubility of 15mg/ml at room temperature. What is the molar concentration at this solubility? Give your answer to 3 decimal places.
Molar concentration = Moles of solute (n) / Volume of solution (L), so if solubility of aspirin is 15 mg/ml (room temperature), there is solubility in g/l equal to 15...
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Sulphuric acid has a molecular mass of 98 and a density of 1.94 g/mL. You are given a 10% v/v solution of sulphuric acid. What is its molar concentration? Give your answer to 2 decimal places.
If we have 1L of solution, then we have 100 ml (0.1L = 10% from 1L) of sulphuric acid in it. Find the mass of 100 ml of sulphuric acid:...
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Given that the molar mass of NaCl is 58.44 g/mol, what is the molarity of a solution that contains 87.75 g of NaCl in 500. mL of solution?
Answer: Calculate number of moles of NaCl in solution = 87.75 g/ 58.44 g/mole = 1.5 moles Molarity of the solution = 1.5 moles/ 0.5 L = 3 moles/ L
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The molecular mass of NaCl is 58.4 g/mol. Calculate the amount of NaCl (in grams) needed to make 18 litres of a 2 molar solution. Give your answer to two decimal places.
2102.40 g
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A mass of gas occupies 1.00 L at 100 kPa. At what pressure does this gas
occupy
a) 2.00 litres,
b) 0.500 litres?
P1 = 100 kPaV1 = 1.00 LSolution:The relationship for Boyle’s Law can be expressed as follows: P1V1 = P2V2, where P1 and V1 are the initial pressure and volume values,...
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