how many molecule are present in 36g of
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Answers
Answer:What are the number of molecules in 36g of water?
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Answer is 1.2×10^24molecules.
Explanation:
To go from the mass of water to molecules of water, we have to do two things:
Convert mass of H2O to moles of H2O using the molar mass of H2O as a conversion factor.
Convert moles of H2O to molecules of H2O using Avogadro's number (6.02×10^23) as a conversion factor.
Step 1:
Before we start, I should note that the molar mass of H2O is 18.01gmol.
We can go from mass to moles using dimensional analysis. The key to dimensional analysis is understanding that the units that you don't need any more cancel out, leaving the units that are desired:
36g×1mol/18.01g
=2.00mol
Step 2:
We'll use the following relationship:
Explanation:
Answer:
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Answer is 1.2×10^24molecules.
Explanation:
To go from the mass of water to molecules of water, we have to do two things:
Convert mass of H2O to moles of H2O using the molar mass of H2O as a conversion factor.
Convert moles of H2O to molecules of H2O using Avogadro's number (6.02×10^23) as a conversion factor.
Step 1:
Before we start, I should note that the molar mass of H2O is 18.01gmol.
We can go from mass to moles using dimensional analysis. The key to dimensional analysis is understanding that the units that you don't need any more cancel out, leaving the units that are desired:
36g×1mol/18.01g
=2.
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Hello there,
This is a question from mole concept, and for any such question, which involves two variables out of the four — moles, molecular mass, number of molecules, and the volume at STP— there is one single concept:
1 mole of a molecule = it's molecular mass= avogadro number of molecules(6.022 *10^23)= volume at stp(22.4L)
And for an atomic substance
1 mole of atoms = it's atomic mass= avogadro number of atoms (6.022 *10^23)= volume at stp(22.4L)
Here, two variables are considered mass and molecules so we take the first formula:
For water, 18 g of H2O has 6.022*10^23
Therefore, 36g of H2O has 2*
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The molecular weight of H2O = 18
Thus, 18 grams of H2O = 1 mol of H2O
36 grams of H2O = 2 mol of H2O
1 mol of H2O = 6.023* 10^23 molecules of H2O
2 mol of H2O = 2*6.023*10^23 molecules of H2O
= 12.046 * 10^23 molecules of H2O
H2O is the formula for Water.
Molecular mass = 2(H)+1(O)
= 2*1 + 1*16 = 2 + 16 = 18 gm
1 gm molecule of water = 18 g of water.
18gm of water contain 6.023 x 10^23 molecules of water
For 36 gm of water contain
36x 6.023 x 10^23/18
= 2 x 6.023 x 10^23 molecules of water
2x6.023x10^23 molecules of water