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CHEM0305010
The molecular formula of benzene is C₆H₆. Find the empirical formula of benzene.
CHEM0305020
The molecular formula of ethanoic acid is CH₃COOH. What is the empirical formula of ethanoic acid?
CHEM0305030
Which of the following is true about the molecular formula of a compound.
CHEM0305040
Given that the empirical formula of cyclo-hexene is C₃H₅. Which of the following are the possible molecular formula of cyclo-hexene?
The empirical formula of decene is CH₂ and its relative molecular mass is 140. Find the molecular formula of decene. [Relative atomic mass: C,12; H,1]
CHEM0305060
In an experiment, 21g of lithium combined with exactly 14g of nitrogen. Find the empirical formula of lithium nitride. (Relative atomic masses: Li = 7 and N = 14)
CHEM0305070
A hydrocarbon X contains 86% of carbon by mass. Which of the followings are the possible molecular formulas of X?
CHEM0305080
Find the mass of metal X that can combine with 38.4g oxygen to form X oxide with molecular formula X₂O₃. ( Relative Atomic Mass: O,16; X,56 )
CHEM0305090
7.20g of element X reacts with element Y to form a compound that has mass 28.50g. Find the relative atomic mass of Y if the empirical formula of the compound is XY₂.
( RAM: X = 24 )
CHEM0305100
X reacts with bromine to form a bromide compound with the formula XBr₂. A possible molecular formula for the compound of X sulphate is