Answer:
21.3g
Explanation:
The formula of the compound is;
Fe(NO₃)₃
Given:
volume = 500mL = 0.5L
concentration = 0.175mol/L
Unknown:
Mass of Fe(NO₃)₃ measured = ?
Solution:
To solve this problem, find the number of moles first;
Number of moles of Fe(NO₃)₃ = concentration x volume
So;
Number of moles = 0.175 x 0.5 = 0.088mol
Now to find the mass;
Mass = number of moles x molar mass
Molar mass of Fe(NO₃)₃ = 55.8 + 3[14 + 3(16)]
Molar mass of Fe(NO₃)₃ = 55.8 + 3(62) = 241.8g/mol
Mass = 0.088mol x 241.8g/mol = 21.3g
