General Chemistry Answers

A gas has a volume of 800 mL at 23°C and 300 torr. What would the volume of the gas be at 227°C and 600 torr of pressure?

A weather balloon contains 8.80 moles of helium at a pressure of 0.992 atm and a temperature of 25°C at ground level. What is the volume of the balloon under these conditions?

What is the temperature of an 11.2 L sample of carbon monoxide, CO, at 744 torr if it occupies 13.3 L at 55°C and 744 torr?

An organic compound was found to contain 54.5 % C, 9.2 % H, and 36.3 % O.

a. What is the empirical formula of the compound?

b. If the molar mass of the compound is 88.1 g/mol, what is its molecular formula?

Identify the functional group(s) that appear in propranolol. This chemical belongs to the family of medicines known as beta-blockers are drugs that are used to reduce blood pressure. Choose 3 among the list of functional groups:

NH OH O Propranolol

Calculate the concentration of ascorbic acid, in percentage per mass, in a solution prepared by dissolving 22 g of ascorbic acid with 75 g of water.

Calculate the concentration of ascorbic acid, in percentage per mass, in a solution prepared by dissolving 22 g of ascorbic acid with 75 g of water.

1. Solid phosphorous reacts with chlorine gas to produce phosphorous chloride liquid.

How many grams of chlorine gas is required when 1.45 g of phosphorous was used?

2. What volume of hydrogen gas at STP is produced as sulfuric acid acts on 24 g of

calcium?

3.What weight of magnesium is needed to react with HCl to produce 67.2L of hydrogen

gas at STP?

4.What volume of oxygen gas is required to burn 50 L of acetylene gas C2H2 at STP?

“Substance E is composed of clear, red crystals. When the red crystals are heated, they crackle and change into a blue liquid, which cools to form a blue solid. Heating also produces vapour of substance X, which condenses to form a liquid that is a non-conductor of electricity. The colourless liquid of substance X is cooled until it forms a white solid. The solid of substance X does not conduct electricity. The red crystals of substance E are found to be quite soluble in water, but they do not dissolve in kerosene. Neither the red crystals nor the blue solid conducts electricity, although the red aqueous solution of substance E is a good conductor.”

What volume of hydrogen gas at STP is produced as sulfuric acid acts on 24 g of

calcium?