Mole Calculations, also commonly known as Mole Concepts & Chemical Calculations had been identified by students and educators alike, to be one #1 Killer Topic in GCE ‘O’ Levels Chemistry, IP Chemistry, IB Chemistry and IGCSE Chemistry.
Recently, we have seen more students asking us to discuss more in this chemistry blogsite. One of my chemistry student, who is committed to do well in the october’s GCE ‘O’ Levels Chemistry Examinations, had sent me a series of questions related to Mole Calculations.
They are questions that are not really difficult to comprehend and score, but you must have strong essential concepts & a good strategy to solve it. Let’s check out the questions:
A mixture of 8g of hydrogen gas and 8g of oxygen gas is burnt and the rxn is represented by the equation below. What is the mass of water formed?
2H2(g) + O2 (g) –> 2 H2O (l)
An element of E forms a hydride with the formula EH3 which contains 90% of E by mass. What is the relative atomic mass of E?
Which ion is present in highest concentration in a 2 mol/dm3 sodium sulfate solution
B) SO4 2-
How many chloride ions are in contact with each sodium ion in a crystal lattice of sodium chloride?
If you are a student that will be taking GCE ‘O’ Level Chemistry Exams or other related end-of-year Chemistry Examinations, the above sets of questions will be interesting for you to solve.
PS: Leave your suggested answers and comments in “Leave A Reply” below.
PPS: If you are not strong in Mole Calculations, and would like to have a quick-fix, you might want to consider the upcoming Mole Calculations Mastery Workshop.
Until the next post! See ya!