Percentage Composition and Molecular Formula

The video tutorial covers the calculation of percentage composition of elements in sodium hydrogen phosphate. It begins with an introduction to the topic, followed by a detailed explanation of the molecular formula and molar mass. The video then demonstrates how to calculate the molar mass and percentage composition of sodium, hydrogen, phosphorus, and oxygen in the compound. The tutorial concludes with a summary of the calculations and encourages viewers to practice similar problems.

What is the main focus of the video tutorial?

• Understanding percentage composition and molecular formula

• Studying the history of chemistry

• Calculating the speed of light

• Learning about gravitational forces

Which compound's percentage composition is being calculated in the video?

• Calcium carbonate

• Sodium hydrogen phosphate

• Sodium chloride

• Magnesium sulfate

What is the molecular formula of sodium hydrogen phosphate?

• H2O

• Na2HPO4

• NaCl

• C6H12O6

How is the molecular weight of a compound calculated?

• By subtracting the atomic weights of all atoms in the molecule

• By multiplying the atomic weights of all atoms in the molecule

• By dividing the atomic weights of all atoms in the molecule

• By adding the atomic weights of all atoms in the molecule

What is the percentage composition of sodium in sodium hydrogen phosphate?

• 32.39%

• 21.83%

• 0.70%

• 45.07%

How many moles of hydrogen are present in sodium hydrogen phosphate?

• One mole

• Four moles

• Two moles

• Three moles

What is the percentage composition of phosphorus in sodium hydrogen phosphate?

• 45.07%

• 21.83%

• 0.70%

• 32.39%

What is the percentage composition of oxygen in sodium hydrogen phosphate?

• 32.39%

• 0.70%

• 21.83%

• 45.07%

What is the total percentage composition of all elements in a compound supposed to add up to?

• 50%

• 75%

• 100%

• 25%

What is the atomic weight of oxygen used in the calculations?

• 16

• 31

• 1

• 23