D) 108 6 023 34. How many moles or el A) 6.023 x 10 B) 10" C) G0210 35. The number of hydrogen atoms present in 25.6 g of sucrose (CH2,0,1) which has a molar mass of 342.3 g IS: A) 22 x 10 B) 9.91 x 10 C) 11 x 10 D) 44 x 10° 36. The mass and charge of 1 mole electrons will be: 1 A) I kg: 96500 C B) 0.55 mg: 96500 C C) 1.55 mg: 96500 C D) 5.5 mg: 96500 C 37. How many moles of electrons will together contributes to the charge of 289500 coulomb? 38. What mass of sodium chloride would be decomposed by 9.8 g of sulphuric acid, if 12 g of sodium bisulphate and 2.75 g of hydrogen chloride were produced in a reaction assuming that the law of conservation of mass is true? 39. In an experiment 2.4 g of iron oxide an reduction with hydrogen yield 1.68 g of iron. In another experiment, 2.9 g of iron oxide give 2.03 g of iron on reduction with hydrogen. Show that the above data illustrate the law of constant proportions 40. Two compounds each containing only in tin and oxygen had the following composition: Mass % of in Mass % of oxygen Compound A 78.77 21.23 Compound B 88.12 11.88 Show how this data illustrate the law of multiple proportions? -1. A piece of copper weighs 0.635 g. How many atoms of copper does it contains? 2. What is the mass of 3.01 10-2 molecules of ammonia? 3.116 mg of a compound on vaporization in Victor Meyer's apparatus displaces 44.8 mL. of air measured STP. The molecular mass of the compound is: [ ] A) 116 B) 232 C) 58 D) 44.8 21-22
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Answered by
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Correct option is
B
9.91×10
23
Number of moles of sucrose =
Molarmass
Givenmass
=
342.3
25.6
=0.074 mol
Number of sucrose molecules in 1 mol = 6.022×10
23
Number of sucrose molecules in 0.074 mol = 6.022×10
23
×0.074=4.503×10
22
Number of hydrogen atoms in 1 molecule of sucrose = 22
Therefore, Number of hydrogen atoms in 4.503×10
22
molecules = 22×4.503×10
22
= 9.91×10
23
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