Potassium Mass and Moles Concepts

The video tutorial explains how to determine the amount of potassium chloride in a supplement. It begins by introducing the problem and the given data, including the percentage of potassium and the molar mass of potassium chloride. The tutorial then guides viewers through calculating the mass of potassium, converting it to moles, and using this to find the grams of potassium chloride. The process involves using the molar mass of potassium and potassium chloride, and the tutorial concludes with a discussion on significant figures and the final result.

What percentage of potassium is present in the supplement?

• 50%

• 35%

• 22%

• 10%

What is the molar mass of potassium chloride?

• 39.10 g/mol

• 74.55 g/mol

• 22.00 g/mol

• 150.00 g/mol

What is the atomic mass of potassium?

• 74.55 g/mol

• 150.00 g/mol

• 39.10 g/mol

• 22.00 g/mol

How do you calculate the mass of potassium in the supplement?

• Add the total mass of the supplement to the percentage of potassium.

• Divide the total mass of the supplement by the percentage of potassium.

• Multiply the total mass of the supplement by the percentage of potassium.

• Subtract the percentage of potassium from the total mass of the supplement.

What is the mass of potassium in the supplement if the total mass is 0.4150 grams and the percentage of potassium is 22%?

• 0.0913 grams

• 0.0990 grams

• 0.1500 grams

• 0.2000 grams

How do you convert the mass of potassium to moles?

• Multiply the mass by the molar mass of potassium.

• Subtract the molar mass of potassium from the mass.

• Divide the mass by the molar mass of potassium.

• Add the mass to the molar mass of potassium.

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

• 22.00 g/mol

• 39.10 g/mol

• 74.55 g/mol

• 150.00 g/mol

How many moles of potassium are present if the mass is 0.099 grams and the molar mass is 39.10 g/mol?

• 0.00253 moles

• 0.00253 grams

• 0.00300 moles

• 0.00300 grams

What is the relationship between moles of potassium and moles of potassium chloride?

• 1 mole of potassium equals 2 moles of potassium chloride.

• 1 mole of potassium equals 1 mole of potassium chloride.

• 2 moles of potassium equals 1 mole of potassium chloride.

• 1 mole of potassium equals 0.5 moles of potassium chloride.

What is the final mass of potassium chloride in the supplement?

• 0.189 grams

• 0.150 grams

• 0.250 grams

• 0.200 grams