How many grams of Fe2O3 formed by heating of 18 gm FeO with O2.

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How many moles O2 are required to needed produced 5 moles of Fe2O3.

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367.5 gm KClO3 (122.5) when heated then calculate. (1) How many gram of O2 is produced? (2) How Many litre of O2 is produced at STP?

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Air contain 20 % O2 by volume. How many cm³ of air will be required for oxidation of 100 cm³(ml) of acetylene?

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The hydrated salt, Na2SO4.nH2O undergoes 55.9% loss in weight on heating and becomes anhydrous. The value of n will be?

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Haemoglobin contains 0.33% of Iron by weight. The molecular weight of it is approx. 67200. The numbers of iron atoms (Atomic wt of Fe=56 u) present in one molecule of Haemoglobin are?

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What is the % composition of each element in (Mg(OH)2) magnesium hydroxide?

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Calculate the percent Nitrogen in Dinitrogen (N2O) Monoxide?

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A piece of Cu contains 6.022 x10^24 atoms. How many mole of Cu does it contain?

What is the "Gram Molecular mass" ?

Gram Molecular mass: Gram molecular mass can be defined as the mass of 1 mole of molecules.

What is "Molecular mass ?

Molecular mass : Molecular mass is the number which indicates how many times the mass of one molecule of a substance is heavier in comparison to 1/12th part of the mass of one atom of C-12.

What is Gram atomic mass (GAM) ?

Gram atomic mass : The gram atomic mass can be defined as the mass of 1 mole atoms of an element.

What is Atomic mass unit (amu) ?

The quantity [1/12 mass of an atom of C-12] is known as atomic mass unit. The actual mass of one atom of C-12 = 1.9924x10^-26 kg

What is "Atomic mass" ?

Atomic mass of an element can be defined as the number which indicates how many times the mass of one atom of the element is heavier in comparison to 1/12 th part of the mass of one atom of

Carbon-12.

What is "mole" ?

 A mole is the amount of substance that contains as many species [Atoms, molecules ions or other particles] as there are atoms in exactly 12 gm of C-12

                         [1Mole= 6.022x10^23 Species]

Vapour density of mixture of NO2 and N2O4 is 34.4 , then percentage abundance (by volume) of NO2 in mixture is .

Molecular weight = 2×VD

                                = 2× 34.5 = 69 u

Consider ℅ of NO2 is "x" then % of N2O4 is "100-x"

40 gm metal oxide (MO) contain 4 gm of Oxygen.Calculate the equivalent wt of a metal.

40 gm metal oxide contains 4 gm of Oxygen mean it has 36 gm of metal.

Then Equivalent wt of metal is 

  E_m = (Wt of metal/Wt of Oxygen)×8

  E_m = (36gm /4gm)×8

  E_m = 72 gm equivalent

A metal oxide contains 60% metal by mass. The equivalent weight of metal is ..?

Metal Oxide contains 60% metal by mass means 100g of this oxide has 60 g metal and 40g oxygen.

Equivalent Wt of Metal = (Wt of metal/Wt of Oxygen)×8

E_m = 60×8/40 = 12gm equivalent

When 15 gm of NaCl and Na2CO3 is heated with dilute HCl, 2.5 gm of CO2 is evolved at NTP. Calculate percentage composition of the original mixture.

Brass is an alloy of Cu-Zn. A sample of brass weighing 6.0 g, when treated with excess of dil. H2SO4 gives 328 mL of dry H2 at 27°C and 760 mm pressure. What is the percentage of Cu by weight in the alloy? (Atomic mass of Zn = 65.4 gm)