Achemist prepares a solution of sodium carbonate (na2co3) by measuring out 28 î¼gol sodium carbonate into a 300ml volumetric flask and filling the flask to the mark with water. calculate the concentration in î¼mol of the chemist's sodium carbonate solution. round your answer to significant digits.

Question in incomplete , complete question is;

A chemist prepares a solution of sodium carbonate by measuring out  28μg of sodium carbonate into a  300 mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in μmol/L of the chemist's sodium carbonate solution. Be sure your answer has the correct number of significant digits.

is the concentration of the chemist's sodium carbonate solution.

Explanation:

Mass of sodium carbonate = 28μg =

Volume of the solution = 300 mL = 300 × 0.001 L= 0.3 L

( 1 mL = 0.001 L)

Moles of sodium carbonate =

is the concentration of the chemist's sodium carbonate solution.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.