Empirical Formula of Phosphoric Acid

The video tutorial explains how to calculate the empirical formula of phosphoric acid using percentage composition. It begins with an introduction and a prompt to subscribe for updates. The tutorial then details the process of calculating the empirical formula, including determining the percentage composition of elements, using a table for simplification, and calculating moles and atomic ratios. The final empirical formula is derived as H3PO4. The video concludes with encouragement to share and subscribe.

What is the main topic discussed in the video?

• Molecular weight calculation

• Empirical formula calculation

• Chemical reaction balancing

• Periodic table trends

What percentage of hydrogen is present in phosphoric acid according to the problem statement?

• 100%

• 65.304%

• 3.086%

• 31.61%

How is the percentage of oxygen in phosphoric acid determined?

• By subtracting the percentages of hydrogen and phosphorus from 100%

• By adding the percentages of hydrogen and phosphorus

• By multiplying the percentages of hydrogen and phosphorus

• By dividing the percentages of hydrogen and phosphorus

Which element has the highest percentage composition in phosphoric acid?

• Oxygen

• Phosphorus

• Carbon

• Hydrogen

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

• 16

• 31

• 1

• 8

What is the smallest atomic ratio calculated for the elements in phosphoric acid?

• 2.5

• 4.08

• 3.086

• 1.01

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

• 31

• 16

• 8

• 1

What is the empirical formula of phosphoric acid as determined in the video?

• H2SO4

• H3PO4

• H2O

• HCl

What is the purpose of dividing by the smallest atomic ratio in the calculations?

• To find the molecular formula

• To simplify the atomic ratios to whole numbers

• To calculate the molar mass

• To determine the percentage composition

What is the final step in determining the empirical formula?

• Calculating the molar mass

• Balancing the chemical equation

• Converting atomic ratios to the simplest whole numbers

• Finding the percentage composition