GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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3.64x10^24 molecules
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1.91x10^25 molecules
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5.28x10^-23 molecules
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3.42x10^-24 molecules
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Detailed explanation-1: -Here we have 25.0 g/(18.0g/mole) = 1.39 moles water (3 sig figs). Multiply 1.39 moles times the definition of a mole to arrive at the actual number of water molecules: 1.39 (moles water) * 6.02 x 1023 molecules water/(mole water) = 8.36 x 1023 molecules water.
Detailed explanation-2: -Therefore, in one mole of water (H2O), there are two moles of hydrogen atoms and one mole of oxygen atoms.
Detailed explanation-3: -A mole of anything is 6.022•1023 particles. So, divide the number of molecules by Avogadro’s number, and that’s the number of moles. Answer 4: That’s 0.1 mole of water, because 6 x 1023 is the number of molecules or atoms in a mole.
Detailed explanation-4: -The mole is represented by Avogadro’s number, which is 6.022 × 1023 atoms or molecules per mol.