When 5 g of calcium is burnt in 2 g of oxygen, then 7 g of calcium oxide is produced. What mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen?

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Solution

5 g of calcium react with 2 g of oxygen to form 7 g of calcium oxide.
Using the law of constant proportions, calcium and oxygen react in a fixed ratio of 5:2, by mass, to produce 7 g of calcium oxide.
When 5 g of calcium react with 20 g of oxygen, the same amount of calcium oxide will be formed because 5 g of calcium react with 2 g of oxygen and 18 g of oxygen remain unreacted.
Therefore, 7 g of calcium oxide will be formed when 5 g of calcium will react with 20 g of oxygen.

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WHEN 5G OF CALCIUM IS BURNT WITH 2G OF OXYGEN , THEN 7G OF CALCIUM OXIDE IS PRODUCED . WHAT MASS OF CALCIUM OXIDE WILL BE PRODUCED WHEN 5G OF CALCIUM IS BURNT IN 20G OF OXYGEN

Q. 2.8 g of calcium oxide prepared by heating limestone produced 0.8 g of oxygen. Calculate the mass percentage of calcium.

40 g

of calcium was extracted from

56 g

of calcium oxide
(Atomic mass of

C a = 40, O = 16

)
i) What mass of oxygen is there in

56 g

of calcium oxide?
ii) How many moles of oxygen atoms are there in this?
iii) How many moles of calcium atoms are there in

40 g

of calcium?
iv) What mass of calcium will be obtained from

1000 g

of calcium oxide?

Q. The weight of calcium oxide formed by burning

20

g of calcium in excess oxygen is

:

when 3.0g of magnesium is is burnt in 2.0g of oxygen , 5.0g of magnesium oxide is produced .what mass of magnesium oxide will be formed when 3.0g magnesium is burnt with 5.0g of oxygen ?which law of chemical combination will govern your answer ? state the law

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