Balance the following equation. then determine the mole ratio of ca(oh)2: al(oh)3.
al2(so4)3 + ca(oh)2 al(oh)3 + caso4?
a.)2: 3
b.)3: 2
c.)1: 2
d.)3: 3
e.)1: 1

You can use the mole ratios given by the coefficients in the balanced chemical equation. The coefficients are the smallest whole-number number of moles. 

Aluminum hydroxide is insoluble in water, while calcium sulfate is only marginally soluble. 

Al2(SO4)3(aq) + 3Ca(OH)2(aq) --> 2Al(OH)3(s) + 3CaSO4(s)  
1 mol 3 moles 2 moles 3 moles 
0.725 mol  
0.725 mol 3(0.725) mol 2(0.725) mol ..3(0.725) mol 

Al2(SO4)3(aq) + 3Ca(OH)2(aq) --> 2Al(OH)3(s) + 3CaSO4(s)  
1 mol 3 moles 2 moles 3 moles 
0.774 mol 
0.774 / 3 mol 0.774 mol 2/3(0.774)mol.. 0.774 mol

U whay do you need with?

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.