The vapour pressure of acetone at 20 o C is 185   torr . When 1 . 2   g of a non-volatile substance was dissolved in 100   g of acetone at 20 o C , its vapour pressure was 183   torr . The molar mass ( g   m o l - 1 ) of the substance is:

Question

The vapour pressure of acetone at 20 o C is 185 &#160; torr . When 1 . 2 &#160; g of a non-volatile substance was dissolved in 100 &#160; g of acetone at 20 o C , its vapour pressure was 183 &#160; torr . The molar mass ( g &#160; m o l - 1 ) of the substance is:

Aicharya · Accepted Answer

&#916; P = 1 8 5 - 1 8 3 = 2 torr M CH 3 - C O || - CH 3 = 1 5 &#215; 2 + 1 6 + 1 2 = 58 g/mol &#916; P P 0 = 185 - 183 185 = 2 1 8 5 = X B = 1.2 M 1.2 M + 1 0 0 5 8 1.2 M &#60;&#60; 1 0 0 5 8 &#8658;&#160;&#160; 2 1 8 5 = 1.2 M &#215; 5 8 1 0 0 M = 5 8 &#215; 1.2 1 0 0 &#215; 1 8 5 2 = 64.38 &#8776; 64 g/mol

The vapour pressure of acetone at 20 o C is 185   torr . When 1 . 2   g of a non-volatile…

Solution

The vapour pressure of acetone at 20 o C is 185 &#160; torr . When 1 . 2 &#160; g of a non-volatile…

Solution

The vapour pressure of acetone at 20 o C is 185 torr . When 1 . 2 g of a non-volatile…