Inorganic Chemistry Answers

1.    Determine the boiling and freezing point of a 0.10 molal aqueous NaCl solution.

2.    A solution is prepared by dissolving 27g of urea, (NH2)2CO, in 100g of water. Calculate the boiling and freezing point of the solution. Urea is a nonelectrolyte.

3.    How many grams of table salt must be added to half a liter of water to raise its boiling point by 15°C?

4.    How many grams of table salt must be added to half a liter of water to lower its freezing point by 10°C?

A solution was prepared by dissolving 18.00g of glucose in 150.0g of water. The resulting solution was found to have a boiling point of 0.34°C higher than its pure solvent boiling point at 1 atm. Calculate the molar mass of glucose. Glucose is a molecular solid that is present in individual molecules in solution.

Compute the weight (g) of solute needed to make the solution listed below: 

a.   0.500L of 9.25N K2SO4

1.    An aqueous solution of hydrofluoric acid is 12.5 molal with respect to HF and has a density of 1.070 g/mL at 25oC. Calculate:

a.   mole fraction of HF

b.   %w/w of HF

c.   molarity

d.   molality.

e.   mole fraction of HF

A sample of a compound containing carbon and oxygen have a mass of 88grams.Experimental procedures showed that 24 g of this sample was carbon and the remaining 64 g was oxygen. What is the percentage composition of this compound. Show the solution.

An evaporating dish weighs 44.3170 grams. After 8.5 mL of salt water was added to the dish, the combination of the dish and salt water weighed 52.987 grams. The dish was then heated until a constant mass of 44.5990 grams was obtained. What was the mass percent of salt dissolved in the salt water

Question 5

Express the following number in scientific notation. Do NOT include unit in your answer. Please use e to refer to power of 10. For example, 1 x 10^6 should be entered as 1e6, 4.5 x 10^-7 should be entered as 4.5e-7.

Mass of one staple is 0.0324 g, scientific notation is _____ g.

A piece of Ca metal is placed in a 1.00-L container with pure N2. The N2 is at a pressure of 1.12 atm and a temperature of 26°C. One hour later, the pressure has dropped to 0.924 atm and the temperature has dropped to 24°C. Calculate the number of moles of N2 that reacted with the Ca. *

The catalytic converter that is standard equipment on American automobiles converts carbon monoxide (CO) to carbon dioxide (CO2) by the reaction. What mass of O2, in grams, is needed to react completely with 25.0 g of CO? *

The compound 1-propanethiol, which is the eye irritant released when fresh onions are chopped up, has the chemical formula C3HyS and a formula mass of 76.18 amu. What number does y stand for in the chemical formula of the compound? *

3 points