EMPIRICAL FORMULA AND MOLECULAR FORMULA

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

Find the percent composition of each element in N₂S₂ .

• 69.6% N, 30.4%S
• 15.2% N, 84.8% S
• 30.4% N, 69.6% S
• 65.2% N, 34.8% S

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

• C₂H₅
• C₄H₁₀
• C₁H_2.5
• C₄H₈

A formula with the lowest whole # ratio of elements in a compound is called

• empirical formula
• chemical formula
• covalent formula
• molecular formula

A chemical formula that shows the actual # of atoms present in a compound is called_________

• ionic formula
• covalent formula
• empirical formula
• molecular formula

Which of the following is the correct empirical formula for C₄H₁₀

• C₂H₅
• CH_2.5
• C₈H₂₀
• C₄H₁₀

What is the equation for calculating percent composition?

• mass of element/mass of compound = x 100
• mass of compound/mass of element = x 100 
• total mass/molar mass = x 100 
• molar mass/molar mass = x 100 

Fill in the blanks with coefficient:

PCl₅+_ H₂O→_ HCl+H₃PO₄

• 4, 5

• 1, 6

• 3, 8

• 2,2

The blue numbers in the image below represent ________

• Charges
• coefficients
• subscripts
• none of the answers are correct

How many Elements are in the compound C₂H₈O ?

• 2
• 1
• 3
• 0