How many molecules of sucrose (c12h22o11, molar mass = 342.30 g/mol) are contained in
14.3 ml of 0.140 m sucrose solution?

molecules

Explanation :  

Molarity is defined as the number of moles of solute dissolved per liter of the solution.

where,

n = moles of solute = ?

= volume of solution in liter = 0.0143L

Now put all the given values in the formula of molarity, we get

Therefore, the number of moles is 0.002.

According to Avogadro's law,

1 mole of contains molecules of sucrose.

Thus 0.002 moles of contain= molecules of sucrose.