How much water should be added to 15g of salt to obtain 15% salt solution

85 ml

Explanation:

Mass of solute = 15 g

Mass % = 15 g

Mass % = ( mass of solute / mass of solution ) × 100

Mass of solution = mass of solute + mass of solvent

Mass of solvent = x gram :

15 = ( 15 ) / ( 15 + x ) × 100

1 = ( 1 ) / ( 15 + x ) × 100

15 + x = 100

x= 100 - 15

= 85 g

Now ,

Volume = mass / density :

Density of water = 1 g / mL

Volume = 85 mL

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.