Chemistry Answers

When you react 3.9367 grams of Na2CO3.nH20 with excess HCl.0.6039 grams of a gas is given off. What is the number of water molecules bonded to the salt?

How much heat is required to convert 40.0 grams of ice at -10.0 degrees Celsius to 100.0 degrees Celsius? The specific heat of ice is 2.1 J/g degrees Celsius.

Express the quantity in the unit indicated and designate whether this heat is gained or lost by the substance.

a. The quantity of heat in calories when 162.5 grams of water undergoes a temperature decrease from 45.84 degrees Celsius to 40 degrees Celsius

b. The quantity of heat in Kilojoules when 43.5 Kg of chloroform, CHCl3 has its temperature changed from 16.8 degrees Celsius to 22.3 degrees Celsius (specific heat of CHCl3 = 0.971KJ/kg-degrees Celsius

Calculate the change in energy for the following processes. Determine if the process is endothermic or exothermic.

1. A gas releases 35 J of heat as 84 J of w was done to compress it.

2. A gas absorbs 48 J of heat as it does 72 J of work by expanding.

The boiling point of chloroform increased by 3.68 degrees C when 0.167 g of an unknown sample was dissolved in 1.00 g of chloroform (Kb = 3.63 degrees C/m). Find the molar mass of the unknown compound.

When a mass 337 mg of an unknown compound was dissolved in 750mL of water, the solution's freezing point became -3.90 degrees C. Suppose the Kf is 1.86 degrees C/m, find the molar mass of the unknown compound.

Find the mass of fructose (C6H12O6) present in a solution containing 9,370.0 mg acetic acid to elevate the boiling point by 9.1 degrees C. Kb is 3.08 degrees C/m.

Find the vapor pressure of a solution containing 35.0 g calcium chloride (CaCl2) in 750.0 g water. Note that P^0 water = 47.1 torr at 37.0 degrees C.

What do you think will happen if you put salt on ice cudes?

What do you think happens to the property of a liquid once a solid is dissolved in it?