Question #9c132
1 Answer
We just may apply expression for molarity.
Explanation:
According to molarity (or molar concentration) expression:
We know that
Now, let us calculate the mass of
- For carbon, C, we know that there are 16 atoms for every molecule of methylene blue. Its atomic mass is 12.01 amu (atomic mass units), so there are
#12.01 cdot 16 = color(blue) 192.16# amu of C per molecule. Analogously, we can say that there are 192.16 g of C per mol of methylene blue (atomic mass on amu and molar mass on g/mol are equivalent).
We just may apply this method to all the elements on methylene blue molecule:
- For hydrogen:
#1.01 cdot 18 = color(blue) 18.18# g/mol. - For nitrogen:
#14.01 cdot 3 = color(blue) 42.03# g/mol. - For sulphur:
#32.07 cdot 1 = color(blue) 32.07# g/mol. - For chlorine:
#35.43 cdot 1 = color(blue) 35.43# g/mol.
The sum of all being:
If we need 0.04 mol of