SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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6.022 X 1019
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6.022 X 1020
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6.022 X 1021
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6.022 X 1023
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Detailed explanation-1: -1 mole = 6. 022 × 1023 units. So for atoms, 1 mole = 6.022 × 1023 atoms. Thus, 6.022 × 1023 atoms of He contains 1 mole.
Detailed explanation-2: -For example: one mole of Helium contains 6.02 x 1023 atoms of Helium and it has a mass of 4.00260 grams. At 0°C and one atmosphere of pressure, it would occupy 22.4 Liters.
Detailed explanation-3: -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-4: -A mole is defined as the number of atoms in 12 grams of Carbon-12. The number of atoms or molecules in a mole is known as Avogadro’s number, and is equal to 6.022 x 1023. A mole is the SI unit for amount of a pure substance.
Detailed explanation-5: -The MOLE (mol) is a unit of measurement that is the amount of a pure substance containing the same number of chemical units (atoms, molecules etc.) as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.022 X 1023).