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Introduction to Alkaline Earth Metals

Number of ato...

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Number of atoms of iron present in 100 g of Fe2O3 having 20% purity is

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Q. One of the reactions that occurs in a blast furnace, where iron ore is converted to cast iron is as follows:

F e_{2} O_{3} + 3 C O ⟶ 2 F e + 3 C O_{2}

1.64 \times 10^{3}

kg of Fe are obtained from

2.62 \times 10^{3}

F e_{2} O_{3}

. Assuming that the reaction goes to completion, what is the percent purity of

F e_{2} O_{3}

in the original sample (rounded to the nearest integer)?

8.33 \times 10^{x}

carbon atoms are present in a diamond weighing

200

20

carat purity. Then, the value of

x

is _______. write the value in the form of x/3.

Q. Number of iron atoms present in haemoglobin molecule is

Q. Percentage purity of a sample of gold is

85 %

. How many atoms of gold are present in its

1

gram sample? (Atomic mass of gold

= 197

Q. The number of iron (Fe) atoms present in a pure sample of solid iron with a mass of 10 grams is equal to- (The atomic mass of iron is 55.9) .

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