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Work out the masses of each substance in this reaction. Use the
periodic table.
Calcium + Sulphur Calcium Sulphide
2a. In a reaction involving oxygen gas we use O2 and not O. Why?
2b. What is the Molecular mass of O2
2c. What is the Formula mass of 2O2
2d. Explain why instead of using a single atom of N in a reaction we
use the single molecule N2
2e.…read more

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Substance mass
3. Here the molecular formula for some common substances.…read more

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Write down the formula equation of this reaction.
Sodium + Hydrochloric Acid Sodium Chloride + Hydrogen gas
4b. Try to balance the equation you have written.
4c. Write down the formula equations of all these
i. Magnesium + Hydrochloric Acid Magnesium Chloride + Hydrogen gas
ii. Sodium Hydroxide + Hydrochloric Acid Sodium Chloride + Water
iii. Calcium Hydroxide + Hydrochloric Acid Calcium Chloride + Water
4d. Now balance them
5a. Here are some balanced equations. Work out the formula
masses of each one.
i.…read more

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For the first equation instead of using 2g of hydrogen gas in the
reaction a chemist used 8g. Then how much HCl will be produced in
the reaction?
5c. If instead of using 71g of chlorine gas in reaction two 7.1g was
used. Then how many grams of sodium were used?
5d. For the last reaction above what is the percentage of water
mass in the total product?
6a.…read more

Page 6

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Number of moles of K= ______________
Number of moles of Cl2 = ______________
After Reaction
Number of moles of KCl = ______________
6c. One mole of chlorine atoms weight 35.5g but one mole of
chlorine molecules weight 71g. Why?
6d. How much does one mole of these substances weight?
Oxygen atoms __________ Oxygen gas ___________
Sodium atoms __________ Carbon dioxide gas ____________
Iron atoms ____________ Sodium Chloride _____________
6e.…read more

Page 7

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What is the concentration of each of these if a substance X is
totally dissolved in each?
(1 mole in 1000cm3 is 1Molar 1M Concentration)…read more

Page 8

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Work out the number of moles of each substance and then the
concentration of these solutions.…read more


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