GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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53
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63.55g
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126.9
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6.02 x 1023
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Detailed explanation-1: -One mole of lead (Pb) contains 6.02 × 1023 atoms and its mass is 207.2 g.
Detailed explanation-2: -One mole of any substance contains 6.02 X 1023 units of that substance. Equally important is the fact that one mole of a substance has a mass in grams numerically equal to the formula weight of that substance.
Detailed explanation-3: -The value of the mole is equal to the number of atoms in exactly 12 grams of pure carbon-12. 12.00 g C-12 = 1 mol C-12 atoms = 6.022 × 1023 atoms • The number of particles in 1 mole is called Avogadro’s Number (6.0221421 x 1023).
Detailed explanation-4: -A mole, abbreviated as mol, is a measurement of amount used by scientists. One mole is equal to 6.022x1023 units.
Detailed explanation-5: -Solution: Mole: the amount of a substance that contains 6.02×1023 respective particles of that substance. The molar mass of lithium is 6.941 g/mol. Answer: 0.34 mol is the number of moles of lithium.