Asolution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 ml solution. what is the weight/weight % or percent by mass of the solute? (i got 5.64% but it said it was incorrect, and i can't figure it out? )

A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. The weight/weight % or percent by mass of the solute is :

2.67%

Explanation:

Note : Look at the density of potassium nitrate in water if given in the question.

You are calculating weight /Volume not weight/weight % or percent by mass of the solute

Here the weight/weight % or percent by mass of the solute is asked : So first convert the VOLUME OF SOLUTION into MASS

Density of potassium nitrate in water KNO3 = 2.11 g/mL

Density = 2.11 g/mL

Volume of solution = 86.4 mL

Mass of Solute = 4.87 g

Mass of Solution = 183.2 g

w/w% of the solute =

w/w%=2.67%

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).