Correct Answer: Option C

Explanation

Given: 

Volume, V = 200 cm\(^3\)

Concentration, C = 5.6 g/dm\(^3\)

Molar mass of KOH, M = 56 g/mol

Number of moles, n = \(\frac{CV}{1000}\)

But because mass concentration was given in g/dm\(^3\) instead of molar concentration (mol/dm\(^3\)) to enable us calculate the number of moles, we'll have to convert concentration from mass to molar using the relationship below:

        Molar concentration (mol/dm\(^3\)) =  \(\frac{mass concentration}{Molar Mass}\)

                                                                = \(\frac{5.6}{56}\) = 0.1 mol/dm\(^3\)

Now, we can find the number of moles using, Number of moles, n = \(\frac{0.1 X  200}{1000}\) = 0.02 mole

The correct answer is option C

• What is the meaning of agricultural sciences? Answer this

  1 Answers   ·   Agricultural Science   ·   3 days ago
• Does WAEC give Calculator to student for there exam? Answer this

  2 Answers   ·   Mathematics   ·   2 days ago
• 2(3)+2? Answer this

  1 Answers   ·   Mathematics   ·   2 days ago