General Chemistry Answers

Determine the molar enthalpy of the balanced reaction if 4441.9 kJ of energy is released when 100 g of C₈H₁₈ combusts with 400 g of O₂.

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1. Calculate the volume (in mL) of 2.25 M HNO3 solution required to react with 24.2 mL of 3.50 M NaOH solution.

2.What volume (in mL) of 4.35 M HCl solution is needed to react with 18.5 g of CA(OH)2 ?

3.How many grams of silver chromate (Ag2CrO4) will precipitate when 86.0 mL of 0.200 M silver nitrate (AgNO3) is added to 50.0 mL of 0.300 M chromate (K2CrO4)? ( Molar mass of Ag2CrO4 = 331.74 g/ mol).

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1. Calculate the mole fraction of each components of a solution containing 65 g of ethanol (C2H6O) in 350 g of water.

2.What are the mole fraction big hydrochloric acid (HCl) and water in a 20% (w/w) aqueous HCl solution.

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1. Calculate the molality of a solution containing 10.8 g of ethylene glycol(C2H6O2) in 360g of water.

2.what is the molality of a 60.5% by mass of nitric acid (HNO3) solution.

3.Calculate the molality of a solution containing 2.80 moles of ethyl alcohol (C2H6O) in 500 mL of solution.

4 determine the molarity of a solution containing 2.40 g of solution chloride (NaCl) in 40.0 mL of solution.(molar mass of NaCl = 58.45g/mol)

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1.Calculate the mass(in grams) of magnesium chloride (MgCl2) that would be needed to prepare 150 mL of a 20% by mass aqueous solution of the salt.The density of the solution is 1.1g/mL.

3. A solution is prepared by dissolving 20 mL of pure hydrogen peroxide (H2O2) in enough water to make 200 mL of solution.What is the concentration of the H2O2 solution?

1. Plot a log C-pH diagram for a system containing 10⁻² M TOTPO₄.
2. Prepare a table showing the pH and the concentration of all phosphate species for HCl additions of 0, 5, 10, 15, 20, 25 and 30 meq/L to a solution of 10⁻² M Na₃PO_4..