#1 | Mole Concept
(Chemistry) > Some Basic Concepts Of Chemistry
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Mole fraction of the solute in a 1.00 molal aqueous solution is 

(1) 0.0177

(2) 0.0344

(3) 1.7700

(4) 0.1770

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6.02x1020 molecules of urea are present in 100mL of its solution. The concentration of solution is 

(1) 0.02M

(2) 0.01M

(3) 0.001M

(4) 0.1M

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Which has the maximum number of molecules?

(1) 7g N

(2) 2g H

(3) 16g NO

(4) 16g O

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The number of moles of oxygen in 1L of air containing 21% oxygen by volume, under standard conditions, is 

(1) 0.0093 mole

(2) 2.10 moles

(3) 0.186 mole

(4) 0.21 mole

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Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at. weight = 78.4), then minimum molecular weight of peroxidase anhydrase enzyme is

(1) 1.568 x 10

(2) 15.68

(3) 2.168 x 10

(4) 1.568 x 10

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