Read the statement.

a 200 ml nacl solution with a concentration of 4.0 g/l is mixed with a 600 ml solution containing 8% nacl (m/v).

what is the final concentration of salt in the solution in g/l?

a.4.7
b.61
c.6.1
d.47

Answer : The correct option is, (B) 61  g/L

Explanation :

First we have to calculate the mass of NaCl.

As, 1000 ml NaCl solution contain 4 grams of NaCl

So, 200 ml NaCl solution contain grams of mass of NaCl

Now we have to calculate the mass of another NaCl.

As, 100 ml NaCl solution contain 8 grams of NaCl

So, 600 ml NaCl solution contain grams of NaCl

Total mass of NaCl = 0.8 + 48 = 48.8 g

Total volume of NaCl solution = 200 + 600 = 800 ml

Now we have to calculate the final concentration of salt in the solution.

Therefore, the final concentration of salt in the solution is, 61 g/L

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