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Free CBSE - Class 11 Chemistry - Some Basic Concepts of Chemistry worksheets

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1.
A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38 g carbon dioxide, 0.690 g of water and no other products. A volume of 10.0 L (measured at STP) of this welding gas is found to weigh 11.6 g. Calculate (ii) molar mass of the gas
2.
A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38 g carbon dioxide, 0.690 g of water and no other products. A volume of 10.0 L (measured at STP) of this welding gas is found to weigh 11.6 g. Calculate (iii) molecular formula.
3.
Calcium carbonate reacts with aqueous HCl to give (CaCl_{2}) and (CO_{2}) according to the reaction, (CaCO_{3} (s) + 2 HCl (aq) \rightarrow CaCl_{2} (aq) + CO_{2}(g) + H_{2}O(l))
What mass of (CaCO_{3}) is required to react completely with 25 mL of 0.75 M HCl?
4.
Chlorine is prepared in the laboratory by treating manganese dioxide ((MnO_{2})) with aqueous hydrochloric acid according to the reaction
(4 HCl (aq) + MnO_{2}(s) \rightarrow 2H_{2}O (l) + MnCl_{2}(aq) + Cl_{2} (g))
How many grams of HCl react with 5.0 g of manganese dioxide?
5.
How many significant figures should be present in the answer of the following calculations?
(iii) 0.0125 + 0.7864 + 0.0215
6.

Use the data given in the following table to calculate the molar mass of naturally occuring argon isotopes:

7.
Calculate the number of atoms in each of the following (i) 52 moles of Ar
8.
Calculate the number of atoms in each of the following (ii) 52 u of He
9.
Calculate the number of atoms in each of the following (iii) 52 g of He.
10.
A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38 g carbon dioxide, 0.690 g of water and no other products. A volume of 10.0 L (measured at STP) of this welding gas is found to weigh 11.6 g. Calculate (i) empirical formula
- OR -

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