Skip to content

Course home

Sign up

Atoms and reactions

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137
Question 21

Which of the following gas samples contains the greatest total number of atoms?

(Relative atomic masses: H=1.0H = 1.0H=1.0, N=14.0N = 14.0N=14.0, O=16.0O = 16.0O=16.0, Ar=39.9Ar = 39.9Ar=39.9)

A

60.0 g of Ar60.0\text{ g of Ar}60.0 g of Ar

B

15.0 g of H2O15.0\text{ g of H}_2\text{O}15.0 g of H2​O

C

36.0 g of O336.0\text{ g of O}_336.0 g of O3​

D

12.0 g of NH312.0\text{ g of NH}_312.0 g of NH3​

Markscheme

Atoms and reactions Questions

  1. A Level
  2. /Chemistry
  3. /Atoms and reactions

199 exam-style questions on OCR A A Level Chemistry Atoms and reactions, covering Atomic structure and isotopes, Compounds, formulae and equations, Amount of substance, Acids, and Redox. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank