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1. How many moles are there in 50 g CCl4?

2. How many molecules are there in 25 g H2SO4?

3.what is the mass, in grams, of 1.35×10²³ molecules C6H12O6​


Sagot :

Solution (1)

Step 1: Calculate the molar mass of CCl₄.

molar mass = (12.01 g/mol × 1) + (35.45 g/mol × 4)

molar mass = 153.8 g/mol

Step 2: Calculate the number of moles of CCl₄.

[tex]\text{moles of CCl₄ = 50 g CCl₄} × \frac{\text{1 mol CCl₄}}{\text{153.8 g CCl₄}}[/tex]

[tex]\boxed{\text{moles of CCl₄ = 0.325 mol}}[/tex]

Solution (2)

Step 1: Calculate the molar mass of H₂SO₄.

molar mass = (1.008 g/mol × 2) + (32.07 g/mol × 1) + (16.00 g/mol × 4)

molar mass = 98.09 g/mol

Step 2: Calculate the number of molecules of H₂SO₄.

[tex]\text{number of H₂SO₄ molecules = 25 g H₂SO₄} × \frac{\text{1 mol H₂SO₄}}{\text{98.09 g H₂SO₄}} × \frac{\text{6.022 × 10²³ H₂SO₄ molecules}}{\text{1 mol H₂SO₄}}[/tex]

[tex]\boxed{\text{number of H₂SO₄ molecules = 1.53 × 10²³ molecules}}[/tex]

Solution (3)

Step 1: Calculate the molar mass of C₆H₁₂O₆.

molar mass = (12.01 g/mol × 6) + (1.008 g/mol × 12) + (16.00 g/mol × 6)

molar mass = 180.16 g/mol

Step 2: Calculate the mass of C₆H₁₂O₆.

[tex]\text{mass of C₆H₁₂O₆ = 1.35 × 10²³ C₆H₁₂O₆ molecules} × \frac{\text{1 mol C₆H₁₂O₆}}{\text{6.022 × 10²³ C₆H₁₂O₆ molecules}} × \frac{\text{180.16 g C₆H₁₂O₆}}{\text{1 mol C₆H₁₂O₆}}[/tex]

[tex]\boxed{\text{mass of C₆H₁₂O₆ = 40.4 g}}[/tex]

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