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What is empirical formula?
The empirical formula shows the simplest whole number ratio of the atoms present in a compound.
What is molecular formula?
The molecular formula shows the actual number of atoms of each element present in a molecule (covalent compound) or formula unit (ionic compound) of a compoun
What is Avogadro constant?
The number of atoms in 12g of 12C is called the Avogadro constant.
What is the mass of 0.2 mol of calcium carbonate, CaC03?
20 g
What is the number of moles in 54g of water, H20?
3 mol
What is the relative formula mass (M,) of magnesium carbonate, MgC03?
84
Give the empirical formulae?
KMnO4
Will+ A compound has the empirical formula CH2. If the relative formula mass is 56, work out the molecular formula.
C4H8
Tell the difference between empirical and molecular formula?
Correct!!!
Give the empirical formula?
BaCl2·2H20
C₄H₁₀ + O₂ → CO₂ + H₂O balance the equation
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
What is the relative atomic mass of chlorine if a sample contains 75% of the isotope chlorine-35 (with an atomic mass of 35) and 25% of the isotope chlorine-37 (with an atomic mass of 37)?
35.5
When calcium carbonate, CaC03, is heated, calcium oxide is formed. Imagine you wanted to calculate the mass of calcium oxide produced by heating 25 g of calcium carbonate (A,: C = 12, 0 = 16, Ca = 40). Find the mass of calcium oxide.
14g
Suppose you do a calculation and work out that you should get 12.5g of copper sulfate crystals, but you only get 11 .2 g when you actually do the experiment. Find percentage yield.
89.6%
What is molar volume?
The volume occupied by 1 mole of a gas is often called the molar volume.
