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Some Basic Concepts of Chemistry

Short Answer Type

231.

Calculate the mass of nitrogen supplied to the soil by 5Kg of urea [CO(NH₂)₂]?

Multiple Choice Questions

232.

20 mL solution of 0.1 M ferrous sulphate was completely oxidised using a suitable oxidising agent. What is the number of electrons exchanged?

1.204 x 10²²
193
1930
1.204 x 10²¹

Short Answer Type

233.

Calculate the molar mass of the following:
H₂O

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234.

Calculate the molar mass of the following:
CO₂

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235.

Calculate the molar mass of the following:
CH₄

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236.

Calculate the molecular mass of glucose (C₆H₁₂O₆) molecule.

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237.
Calculate the gram molecular mass of sugar (C₁₂H₂₂O₁₁).

Mass of carbon =12g
Mass of oxygen=16g
Mass of hydrogen= 1g

Molecular mass of sugar (C₁₂H₂₂O₁₁₎ = 12 x (At. mass of carbon) + 22 x (At. mass of hydrogen) + 11 x (At. mass of oxygen)
= 12 x 12 + 22 x 1 +11 x 16 = 342 amu
Gram molecular mass of C₁₂H₂₂O₁₁= 342 g