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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.

Molecular mass of glucose (C₆H₁₂O₆) =Mass of carbon +mass of hydrogen +mass of oxygen

Mass of carbon =12.011amu
Mass of oxygen=16.00 amu
Mass of hydrogen=1.008 amu

= 6(12.011 amu) +12 (1.008 amu) + 6(16.00 amu)
= 72.066 amu + 12.096 amu + 96.00 amu
= 180.162 amu

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