For an overall or average composition of $60$mol$\%A{l}_2{O}_3-$ Draw a line to show

this on the phase diagram above and use and other lines to support some of your

calculations. Give your answers in mol$\%$ and be sure to list both constituents

At $2250C(3$ points$)$

What phase$($s$)$ are present?

What is$($are$)$ the composition$($s$)$ of the phase present?

What are the amounts $(\%)$ of the phase present?

At $2150C(3$ points$)$

What phase$($s$)$ are present?

What is$($are$)$ the composition$($s$)$ of the phase present?

What are the amounts $(\%)$ of the phase present?