HSC Science (Electronics) इयत्ता ११ वी - Maharashtra State Board Question Bank Solutions for Chemistry

Calculate the molecular mass of the following in u.

CH₃COOH

Calculate the molecular mass of the following in u.

C₂H₅OH

What is the ratio of molecules in 1 mole of NH₃ and 1 mole of HNO₃?

Solve problem:

The mass of an atom of hydrogen is 1.008 u. What is the mass of 18 atoms of hydrogen?

Solve problem:

Calculate the number of an atom of the following (Given: Atomic mass of I = 127 u).

254 u of iodine (I)

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Calculate the number of an atom of the following (Given: Atomic mass of I = 127 u).

254 g of iodine (I)

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Arjun purchased 250 g of glucose (C₆H₁₂O₆) for Rs 40. Find the cost of glucose per mole.

Solve the problem:

The natural isotopic abundance of ¹⁰B is 19.60% and ¹¹B is 80.40 %. The exact isotopic masses are 10.13 and 11.009 respectively. Calculate the average atomic mass of boron.

24 g of carbon reacts with some oxygen to make 88 grams of carbon dioxide. Find out how much oxygen must have been used.

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Calculate the number of atoms of the following. (Average atomic mass : N = 14 u, S = 32 u)

0.4 mole of nitrogen

Solve problem:

Calculate the number of atoms of the following. (Average atomic mass : N = 14 u, S = 32 u)

1.6 g of sulfur

Solve problem:

Calculate the number of moles of magnesium oxide, MgO in

1. 80 g, and
2. 10 g of the compound.

(Average atomic masses of Mg = 24 and O = 16)

Calculate the number of atoms of hydrogen present in 5.6 g of urea, \[\ce{(NH2)2CO}\]. Also calculate the number of atoms of N, C, and O.

Solve problem:

Calculate the mass of sulfur dioxide produced by burning 16 g of sulfur in excess of oxygen in the contact process. (Average atomic mass : S = 32 u, O = 16 u)

Explain the need of the term average atomic mass.

Explain formula mass with an example.

What is a limiting reagent? Explain.

Explain the term molarity

Write postulates of Bohr’s Theory of hydrogen atom.

Mention demerits of Bohr’s Atomic model.