EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100

What is the difference between an empirical formula and a molecular formula? Can they ever be the same?

Important Questions on Using Moles

EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 6 - Using Moles>Q>Q 4
What is the empirical formula for benzene C6H6?
EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 6 - Using Moles>Q>Q 5
A compound has the empirical formula CH2. Its Mr is 28. What is its molecular formula?
HARD
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 6 - Using Moles>Q>Q 6
A hydrocarbon is 84 % carbon, by mass. Its relative molecular mass is 100. Find its empirical formula and molecular formula.
HARD
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 6 - Using Moles>Q>Q 7
An oxide of phosphorus has an Mr value of 220. It is 56.4 % phosphorus. Find its molecular formula.
EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 6 - Using Moles>Q>Q 1
Define the term % yield.
EASY
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 6 - Using Moles>Q>Q 1
Define the term % purity.
HARD
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 6 - Using Moles>Q>Q 2
100 g of aspirin was obtained from 100 g of salicylic acid. What was the % yieId?
HARD
Upper Secondary: IGCSE
IMPORTANT
Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 6 - Using Moles>Q>Q 3
17 kg of aluminium was produced from 51 kg of aluminium oxide (Al2O3) by electrolysis. What was the percentage yield? Ar: Al= 27, O=16