Calculate the mass of 10cm3 of a 0.4g/dm3 solution of sodium carbonate

0.004g

Explanation:

Given parameters:

Volume of sodium carbonate  = 10cm³;  this is also 0.01dm³

Density of solution = 0.4g/dm³

Unknown:

Mass of the solution   = ?

Solution:

To solve this problem, we must understand that ;

 Mass  = density x volume

 So;

        Mass = 0.4 x 0.01  = 0.004g

the answer is c

tell me if wrong

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.