Chemical Composition and Molar Mass

The video tutorial explains how to determine the empirical formula of an acid isolated from clover leaves, which contains carbon, hydrogen, and oxygen. By heating the acid and measuring the resulting carbon dioxide and water, the tutorial guides through calculating the moles of each element. It then demonstrates how to find the simplest whole number ratio of these elements to determine the empirical formula, CHO2.

What elements are present in the acid isolated from clover leaves?

• Hydrogen, Nitrogen, Oxygen

• Carbon, Hydrogen, Oxygen

• Carbon, Hydrogen, Nitrogen

• Carbon, Nitrogen, Oxygen

What is the mass of carbon dioxide produced from heating the acid?

• 0.501 grams

• 0.513 grams

• 0.137 grams

• 0.103 grams

How do you calculate the moles of carbon from carbon dioxide?

• Multiply the mass of carbon dioxide by the molar mass of carbon dioxide

• Multiply the mass of carbon dioxide by the molar mass of carbon

• Divide the mass of carbon dioxide by the molar mass of carbon

• Divide the mass of carbon dioxide by the molar mass of carbon dioxide

What is the molar mass of water used in the calculations?

• 18 grams per mole

• 12 grams per mole

• 16 grams per mole

• 44 grams per mole

How many moles of hydrogen are present in the water produced?

• 0.00572 moles

• 0.114 moles

• 0.0114 moles

• 0.0228 moles

What is the total mass of the original acid sample?

• 0.137 grams

• 0.513 grams

• 0.501 grams

• 0.365 grams

How is the mass of oxygen in the original acid determined?

• By multiplying the masses of carbon and hydrogen

• By subtracting the masses of carbon and hydrogen from the total mass

• By dividing the total mass by the sum of carbon and hydrogen masses

• By adding the masses of carbon and hydrogen

What is the molar mass of oxygen used in the calculations?

• 44 grams per mole

• 16 grams per mole

• 12 grams per mole

• 18 grams per mole

What is the empirical formula of the acid?

• CHO

• CH2O

• CHO2

• C2H2O

What is the ratio of moles of carbon to hydrogen to oxygen in the empirical formula?

• 1:1:2

• 1:2:1

• 1:1:1

• 2:1:1