Glauber’s salt is made up of crystals of hydrated sodium sulfate, $\text{Na}_2\text{SO}_4 \cdot x\text{H}_2\text{O}$, and it can be used in detergent manufacture. A sample of Glauber’s salt was heated, and $1.91\,\text{g}$ of water was driven off, leaving $1.51\,\text{g}$ of anhydrous $\text{Na}_2\text{SO}_4$. What is the value of $x$ in $\text{Na}_2\text{SO}_4 \cdot x\text{H}_2\text{O}$?
- A1
- B8.85
- C10
- D11.25