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### Question

Numver of Mole:

How many mole are in;

1.6g of sodium (Na)

2.500g of Magnesium Oxide (Mg0)

How many grams are there in;

3. 5 moles of silver(Ag)

4. 20 moles of water(H²O)

### Answer #1 for Questions: Numver of Mole:

How many mole are in;

1.6g of sodium (Na)

2.500g of Magnesium Oxide (Mg0)

How many grams are there in;

3. 5 moles of silver(Ag)

4. 20 moles of water(H²O)

**Solution (1)**

[tex]text{moles of Na = 6 g Na} × frac{text{1 mol Na}}{text{22.99 g Na}}[/tex]

[tex]boxed{text{moles of Na = 0.261 mol}}[/tex]

**Solution (2)**

__Step 1: Calculate the molar mass of MgO.__

molar mass = (24.31 g/mol × 1) + (16.00 g/mol × 1)

molar mass = 40.31 g/mol

__Step 2: Calculate the number of moles of MgO.__

[tex]text{moles of MgO = 500 g MgO} × frac{text{1 mol MgO}}{text{40.31 g MgO}}[/tex]

[tex]boxed{text{moles of MgO = 12.4 mol}}[/tex]

**Solution (3)**

[tex]text{mass of Ag = 5 mol Ag} × frac{text{107.87 g Ag}}{text{1 mol Ag}}[/tex]

[tex]boxed{text{mass of Ag = 539 g}}[/tex]

**Solution (4)**

__Step 1: Calculate the molar mass of H₂O.__

molar mass = (1 g/mol × 2) + (16 g/mol × 1)

molar mass = 18 g/mol

__Step 2: Calculate the mass of H₂O.__

[tex]text{mass of H₂O = 20 mol H₂O} × frac{text{18 g H₂O}}{text{1 mol H₂O}}[/tex]

[tex]boxed{text{mass of H₂O = 360 g}}[/tex]

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