1.

Which of the following would weigh the highest?A. 0.2 mole of sucrose (C12H22O11)B. 2 moles of CO2C. 2 moles of CaCO3D. 10 moles of H2O

Answer»

A. 0.2 mole of sucrose (C12H22O11):

Given: Number of moles = 0.2

Molar mass of C12H22O11 = 342 g/mol

To find out the mass of sucrose, apply the formula given:

Number of moles = \(\frac{Mass}{Molar\,mass}\)

⇒ 0.2 = \(\frac{mass}{342\,g/mol}\)

⇒ Mass = 0.2 mol × 342g/mol

⇒ Mass = 68.4g

Thus, the mass of sucrose is 68.4 g.

B. 2 moles of CO2:

Given: Number of moles = 2

Molar mass of CO2 = 44 g/mol

To find out the mass of sucrose, apply the formula given:

⇒ Mass = 2 mol × 44g/mol

⇒ Mass = 88g

Thus, the mass of CO2 is 88 g.

C. 2 moles of CaCO3:

Given: Number of moles = 2

Molar mass of CaCO3 = 40 + 12 + 3× 16 = 100 g/mol

To find out the mass of sucrose, apply the formula given:

Number of moles = \(\frac{Mass}{Molar\,mass}\)

⇒ 2 = \(\frac{mass}{100\,g/mol}\)

⇒ Mass = 2 mol × 100g/mol

⇒ Mass = 200g

Thus, the mass of CaCO3 is 200 g.

D. 10 moles of H2O:

Given: Number of moles = 10

Molar mass of H2O = 18 g/mol

To find out the mass of sucrose, apply the formula given:

Number of moles = \(\frac{Mass}{Molar\,mass}\)

⇒ 10 = \(\frac{mass}{18\,g/mol}\)

⇒ Mass = 10 mol × 18g/mol

⇒ Mass = 180g

Thus, the mass of H2O is 180 g.

Hence, the option C is correct which has higher mass.



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