Question

Calculate the molecular weight of the following substances:
Potassium Dichromate$\left({\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\right)$

Answer 1

• One molecule of Potassium Dichromate$\left({\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\right)$ contains two potassium atoms(Atomic weight=39), two chromium atoms(Atomic weight=52), and seven oxygen atoms(Atomic weight=16).
• The molecular weight of Potassium Dichromate$\left({\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\right)$ will be$\left(2\times 39\right)+\left(2\times 52\right)+\left(7\times 16\right)=78+104+112=294AMU$