How many atoms in a #25.0*g# mass of water?
We calculate the number of moles of water, and then multiply this number by
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The molar mass of water (H2O) is approximately 18.015 g/mol. Using this molar mass, we can calculate the number of moles of water: Number of moles = Mass / Molar mass Number of moles = 25.0 g / 18.015 g/mol ≈ 1.388 moles Since 1 mole of water contains 6.022 x 10^23 molecules (Avogadro's number), we can calculate the number of molecules in the given mass: Number of molecules = Number of moles × Avogadro's number Number of molecules = 1.388 moles × 6.022 x 10^23 molecules/mol ≈ 8.37 x 10^23 molecules Since each water molecule contains three atoms (2 hydrogen atoms and one oxygen atom), we can calculate the total number of atoms: Total number of atoms = Number of molecules × N
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To find the number of atoms in a 25.0 g mass of water (H₂O), follow these steps:
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Calculate the Molar Mass of Water:
- Hydrogen (H) has an atomic mass of approximately 1.01 g/mol.
- Oxygen (O) has an atomic mass of approximately 16.00 g/mol.
- Water (H₂O) has a molar mass of (2(1.01) + 16.00 = 18.02) g/mol.
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Calculate the Moles of Water in 25.0 g:
- Moles of water = mass of water / molar mass of water.
- Moles of water = (25.0 , \text{g} / 18.02 , \text{g/mol}) ≈ 1.387 moles of water.
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Calculate the Number of Molecules of Water:
- Avogadro's number = (6.022 \times 10^{23}) molecules/mol.
- Number of water molecules = (1.387 , \text{moles} \times 6.022 \times 10^{23} , \text{molecules/mol}).
- Number of water molecules ≈ (8.35 \times 10^{23}) molecules.
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Calculate the Total Number of Atoms in the Water Mass:
- Each water molecule consists of 3 atoms (2 hydrogen atoms and 1 oxygen atom).
- Total number of atoms = (8.35 \times 10^{23} , \text{molecules} \times 3 , \text{atoms/molecule}).
- Total number of atoms ≈ (2.51 \times 10^{24}) atoms.
Therefore, a 25.0 g mass of water contains approximately (2.51 \times 10^{24}) atoms.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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