2. A student was asked to make up a 10% w/w solution of sodium carbonate. Calculate the amount of solute and solvent required to prepare that solution? please explain step by step

The amount of the solute and solvent can be calculated by the molality. The equation for the molality is as following:

Molality= (mass of solute*1000)/(molar mass*mass of solvent)

it is given that, 10% of Na2CO3 is made,

It means 100gram solution contains 10gram Na2CO3

So, the Mass of solute = 10 gram

then,

Mass of solvent= 100–10 = 90 gram

And, the molar mass of the Na2CO3 = 106 gram

from, now with the help of formula, we can calculate the amount of solute and solvent.

ljjjljlj kjlk,ljym jlyu; jm; l mumytj

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.