Complete the table

Mass Solute |
Mass Solvent |
Mass Solution |
Mass Percent |

2.55 g |
25.0 g |
_____ |
_____ |

_____ |
45.8 g |
_____ |
3.8% |

1.38 g |
_____ |
27.2 g |
_____ |

23.7 g |
_____ |
_____ |
5.8% |

Solution 46P :

Step 1:

Formula to find mass percent :

Mass percent = 100 %

Mass Solution = Mass solute + Mass solvent

Let’s consider 1st row :

Mass solute = 2.55 g

Mass solvent = 25.0 g

Mass Solution = ?

Mass percent = ?

Mass solution = 2.55 g + 25.0 g

Mass solution = 27.55 g

Mass percent = 100 %

Mass percent = 9.25 %

Step 2:

Mass solvent = 45.8 g

Mass percent = 3.8 %

Mass solute = ?

Mass solution = ?

We know, Mass percent = 100 %

Therefore, 100 % = 3.8 % [Mass solute is considered as ‘x’ ]

Cross multiplying, we get :

x 100 % = 3.8 % (x+ 45.8)

100 x = 3.8 x + (3.8 45.8)

100 x - 3.8 x = 3.8 45.8

x(100 - 3.8) = 174.04

x =

x = 1.809 g

Hence, Mass solute = 1.809 g

Now, let’s calculate mass solvent :

Mass solution = Mass solute + Mass solvent

= 1.809 g + 45.8 g

Mass solution = 47.60 g

Step 3:

Now, let’s consider 3rd row :

Mass solute = 1.38 g

Mass solution = 27.2 g

Mass solvent = ?

Mass percent = ?

Mass solvent = Mass solution - Mass solute

= 27.2 g - 1.38 g

Mass solvent = 25.82 g

Mass percent = 100 %

Mass percent = 5.07 %