One of the active ingredients in stain removers is sodium percarbonate (Na2CO3), and a typical stain remover spray contains 6.5% sodium percarbonate. Calculate the amount (in grams) of sodium percarbonate in 150.0 mL of a 6.5% sodium percarbonate solution.

b. examine and describe cells

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.