thepage="Solutions - Raoults' Law #1"
totl=0
corrt=0
theanswer=""
option=0
varset=new Array()
//updated 12/02/02-netscape 7
thedata=new Array()
thedata[0]=new Array("acetaldehyde",833)
thedata[1]=new Array("acetone",227)
thedata[2]=new Array("benzene",97)
thedata[3]=new Array("chloroform",193)
thedata[4]=new Array("cyclohexane",93)
thedata[5]=new Array("cyclopentane",301)
thedata[6]=new Array("diethylamine",234)
thedata[7]=new Array("diethylether",528)
thedata[8]=new Array("diethylsulfide",59)
thedata[9]=new Array("ethanol",60.1)
thedata[10]=new Array("ethylmercaptan",519)
thedata[11]=new Array("heptane",45.7)
thedata[12]=new Array("hexane",150)
thedata[13]=new Array("methanol",127)
raoults="P<sub>a</sub>=P<sub>o</sub>*X<sub>a</sub>"
rlaws=new Array("X<sub>a</sub>=P<sub>a</sub>/P<sub>o</sub>",raoults,"P<sub>o</sub>=P<sub>a</sub>/X<sub>a</sub>")
thephrase=new Array("A solution of "," with a nonvolatile compound has ",", what is the "," of the ","?")
inserts=new Array()
inserts[0]=new Array(" vapor pressure of "," torr. If P<sup>o</sup> is ",""," mole fraction ")
inserts[1]=new Array(" mole fraction of ",". If P<sup>o</sup> is ",""," vapor pressure ")
inserts[2]=new Array(" mole fraction of "," and a partial pressure of "," torr."," P<sup>o</sup> ")
//programs begin
function startit(){
	clear()
	totl++
	document.forms[0].total.value=totl
	choice=Math.floor(Math.random()*thedata.length);
	chi=0;
	while(chi<.6 || chi>.9)chi=Math.random();
	chi=number(chi,3,3)
	option=Math.floor(3*Math.random())
	buildquest(choice,chi,option)
	}
function buildquest(choice,chi,option){
	thecmpd=thedata[choice][0]
	po=getpo(choice)
	p=chi*po
	chi=number(chi,3,3)
	p=number(p,3,3)
	alldata=new Array(thecmpd,p,po,chi)
	varset[0]=new Array(chi,p,po)
	varset[1]=new Array(p,chi,po)
	varset[2]=new Array(po,chi,p)
	dinsert=(inserts[option][0]+varset[option][1]+inserts[option][1]+varset[option][2]+inserts[option][2]);
	thequest=thephrase[0]+thecmpd+thephrase[1]+dinsert+thephrase[2]+inserts[option][3]+thephrase[3]+thecmpd+thephrase[4]
	showquest(thequest)
	buildanswer()
	}
function buildanswer(){
	theanswer="Raoult's Law states that the observed vapor pressure of a volatile material<br>is the product of the neat vapor pressure and compounds mole fraction:<br>"+raoults
	option==1?theanswer+="<br>Substituting in the values and solving yields:<br>":theanswer+="<br>Rearranging Raoults Law:<br> "+rlaws[option]+"<br>and then substituting and solving yields:<br>"
	theeqn=geteqn()
	theanswer+=theeqn
}
function geteqn(){
	if(option==0)theeqn=p+"/"+po+"="+chi;
	if(option==1)theeqn=po+"*"+chi+"="+p
	if(option==2)theeqn=p+"/"+chi+"="+po
	return theeqn
}
function getpo(choice){
	factor=0
	while(factor<.8 || factor>1.2)factor=Math.random()*2;
	basep=thedata[choice][1]
	po=number(factor*basep,3,3)
	return po
}
function answer(ans){
if(tried==1){
		alert("Sorry, you've already submitted this problem! We'll get you a new one!")
		startit()}
else{
	attempts++
 	if(tried==2){totl++;document.forms[0].total.value=totl}
	if (ans>.95*varset[option][0]& ans<1.05*varset[option][0]){
		document.forms[0].results.value="correct"
		corrt++
		document.forms[0].correct.value=corrt
		tried=1
		}
	else {
		tried=2
		document.forms[0].results.value="incorrect"
	}
}}