// JavaScript Document
thepage="Mass, Moles, and Chemical Formulas"
//11/20/02-updated netscape 7
attempts=corrt=totl=tried=choice=0
theanswer=given=0
solved=0
alldata=0
thequest=""
theanswr=qkey=0
function element(atom,mass){
        this.atom=atom
        this.mass=mass
}
closeit=new Array(")<sub>compound</sub>",")<sub>sample</sub>")
labels=new Array("moles","grams")
ansphrase=new Array("First, identify and evaluate the terms from the chemical formula which will be used to solve the problem. In this case it's "," and "," The solution for the problem is obtained by multiplying the ratio of the two quantities from the formula times the quantity provided regarding the sample.") 
atoms=new Array()
moles=new Array()
atoms[1]=new Array(1,2,4)
moles[1]=new Array(6,14,3)
atoms[2]=new Array(1,2,6,4)
moles[2]=new Array(10,4,2,2)
atoms[3]=new Array(9,7,4)
moles[3]=new Array(2,2,5)
atoms[4]=new Array(1,2,10)
moles[4]=new Array(10,10,1)
atoms[5]=new Array(1,2,3,4)
moles[5]=new Array(8,7,4,2)
atoms[6]=new Array(1,2,8,4)
moles[6]=new Array(4,7,3,1)
atoms[7]=new Array(14,11,4)
moles[7]=new Array(2,1,3)
atoms[8]=new Array(19,2,15,4)
moles[8]=new Array(1,2,1,2)
atoms[9]=new Array(1,2,4,9)
moles[9]=new Array(9,7,2,1)
atoms[10]=new Array(1,2,3,4)
moles[10]=new Array(2,5,1,2)
atoms[11]=new Array(1,2,12,6)
moles[11]=new Array(6,5,1,1)
atoms[12]=new Array(1,2,3,4)
moles[12]=new Array(12,14,2,2)
atoms[13]=new Array(1,2,4)
moles[13]=new Array(16,12,5)
atoms[14]=new Array(1,2,4)
moles[14]=new Array(2,4,1)
atoms[15]=new Array(1,2,3,4)
moles[15]=new Array(2,7,1,1)
atoms[16]=new Array(1,2,3,4)
moles[16]=new Array(2,5,1,1)
atoms[17]=new Array(1,2,3,4)
moles[17]=new Array(8,9,1,1)
atoms[18]=new Array(1,2,4)
moles[18]=new Array(2,4,2)
atoms[19]=new Array(1,2,4)
moles[19]=new Array(4,6,3)
atoms[20]=new Array(1,2,4)
moles[20]=new Array(4,8,2)
atoms[21]=new Array(1,2,4)
moles[21]=new Array(3,6,1)
atoms[22]=new Array(1,2,4)
moles[22]=new Array(9,8,4)
atoms[23]=new Array(1,2,6,4)
moles[23]=new Array(2,3,1,1)
atoms[24]=new Array(1,2,20,4)
moles[24]=new Array(2,3,1,1)
atoms[25]=new Array(1,2,4)
moles[25]=new Array(3,4,2)
atoms[26]=new Array(1,2,3)
moles[26]=new Array(5,5,5)
atoms[27]=new Array(1,2,3,4)
moles[27]=new Array(4,6,2,2)
atoms[28]=new Array(1,2,3,4)
moles[28]=new Array(3,7,3,4)
atoms[29]=new Array(1,2,4)
moles[29]=new Array(2,6,1)
atoms[30]=new Array(1,2,4)
moles[30]=new Array(6,12,6)
atoms[31]=new Array(1,2,4)
moles[31]=new Array(6,10,1)
atoms[32]=new Array(16,3,4)
moles[32]=new Array(1,3,9)
atoms[33]=new Array(16,11,4)
moles[33]=new Array(2,1,5)
atoms[34]=new Array(16,19,4,7)
moles[34]=new Array(1,1,8,2)
atoms[35]=new Array(16,4,7)
moles[35]=new Array(2,12,3)
atoms[36]=new Array(1,2,3,7)
moles[36]=new Array(4,6,2,1)
atoms[37]=new Array(2,3,4,7)
moles[37]=new Array(6,2,3,1)
atoms[38]=new Array(1,2,6)
moles[38]=new Array(5,11,1)
atoms[39]=new Array(1,2,4)
moles[39]=new Array(8,10,2)
atoms[40]=new Array(1,2,3,4)
moles[40]=new Array(6,14,4,2)
atoms[41]=new Array(1,2,3,4)
moles[41]=new Array(4,7,1,4)
atoms[42]=new Array(29,1,4)
moles[42]=new Array(1,1,3)
atoms[43]=new Array(29,1,3)
moles[43]=new Array(1,2,2)
atoms[44]=new Array(29,6,4)
moles[44]=new Array(1,2,8)
atoms[45]=new Array(29,31,4)
moles[45]=new Array(1,2,8)
atoms[46]=new Array(29,7,4)
moles[46]=new Array(1,1,3)
atoms[47]=new Array(1,2,3,4)
moles[47]=new Array(8,10,4,2)
atoms[48]=new Array(25,1,3)
moles[48]=new Array(1,2,2)
atoms[49]=new Array(25,4,6)
moles[49]=new Array(1,2,2)
atoms[50]=new Array(25,32,4)
moles[50]=new Array(1,1,4)
atoms[51]=new Array(25,31,4)
moles[51]=new Array(1,2,8)
atoms[52]=new Array(1,4,5)
moles[52]=new Array(1,1,2)
atoms[53]=new Array(22,7,4)
moles[53]=new Array(2,1,4)
atoms[54]=new Array(1,2,6,4)
moles[54]=new Array(2,3,1,1)
atoms[55]=new Array(1,2,6)
moles[55]=new Array(6,5,1)
atoms[56]=new Array(1,2,6)
moles[56]=new Array(1,1,3)
atoms[57]=new Array(13,3,4)
moles[57]=new Array(1,3,9)
atoms[58]=new Array(13,7,4)
moles[58]=new Array(1,1,4)
atoms[59]=new Array(13,4,6)
moles[59]=new Array(1,2,2)
atoms[60]=new Array(13,4,5)
moles[60]=new Array(1,2,2)
atoms[61]=new Array(1,2,4)
moles[61]=new Array(9,6,2)
atoms[62]=new Array(1,2,4)
moles[62]=new Array(7,8,1)
atoms[63]=new Array(28,1,4)
moles[63]=new Array(1,2,4)
atoms[64]=new Array(28,6,4)
moles[64]=new Array(1,2,8)
atoms[65]=new Array(28,1,3)
moles[65]=new Array(1,1,1)
atoms[66]=new Array(1,3,20)
moles[66]=new Array(1,1,1)
atoms[67]=new Array(1,2,4,7)
moles[67]=new Array(4,10,4,1)
atoms[68]=new Array(21,1,2)
moles[68]=new Array(1,2,6)
atoms[69]=new Array(12,1,2)
moles[69]=new Array(1,12,10)
atoms[70]=new Array(1,2,3,4)
moles[70]=new Array(8,11,1,2)
atoms[71]=new Array(1,2,3,4)
moles[71]=new Array(4,9,1,1)
atoms[72]=new Array(2,3,4)
moles[72]=new Array(3,1,1)
atoms[73]=new Array(1,6,4)
moles[73]=new Array(1,1,1)
atoms[74]=new Array(1,2,6)
moles[74]=new Array(4,9,1)
atoms[75]=new Array(1,2,4)
moles[75]=new Array(3,6,3)
atoms[76]=new Array(23,1,4)
moles[76]=new Array(1,2,4)
atoms[77]=new Array(23,6,4)
moles[77]=new Array(1,2,6)
atoms[78]=new Array(23,7,4)
moles[78]=new Array(1,1,3)
atoms[79]=new Array(1,2,7)
moles[79]=new Array(2,4,5)
atoms[80]=new Array(14,1,4)
moles[80]=new Array(2,1,3)
atoms[81]=new Array(14,6,4)
moles[81]=new Array(1,1,4)
atoms[82]=new Array(1,2,3,4)
moles[82]=new Array(9,15,3,7)
atoms[83]=new Array(12,20,4)
moles[83]=new Array(1,2,6)
atoms[84]=new Array(12,7,4)
moles[84]=new Array(1,1,4)
atoms[85]=new Array(1,2,3,4)
moles[85]=new Array(4,5,1,3)
atoms[86]=new Array(31,7,4)
moles[86]=new Array(1,1,3)
atoms[87]=new Array(1,2,4)
moles[87]=new Array(6,12,6)
atoms[88]=new Array(1,2,4)
moles[88]=new Array(7,4,7)
atoms[89]=new Array(1,2,3,7)
moles[89]=new Array(5,4,4,1)
atoms[90]=new Array(1,2,26,4)
moles[90]=new Array(4,6,1,4)
atoms[91]=new Array(26,7,4)
moles[91]=new Array(1,1,4)
atoms[92]=new Array(26,6,4)
moles[92]=new Array(1,1,3)
atoms[92]=new Array(1,2,3,4)
moles[92]=new Array(11,17,1,3)
atoms[93]=new Array(1,2,4)
moles[93]=new Array(11,8,2)
atoms[94]=new Array(1,2,6)
moles[94]=new Array(10,13,1)
atoms[95]=new Array(27,1,4)
moles[95]=new Array(1,4,4)
atoms[96]=new Array(27,33,4)
moles[96]=new Array(1,1,3)
atoms[97]=new Array(1,2,3,4)
moles[97]=new Array(6,7,3,1)
atoms[98]=new Array(3,4,6)
moles[98]=new Array(1,1,1)
atoms[99]=new Array(3,4,5)
moles[99]=new Array(1,2,1)
atoms[100]=new Array(34,3,4)
moles[100]=new Array(1,2,6)
atoms[101]=new Array(1,20,4)
moles[101]=new Array(5,1,6)
atoms[102]=new Array(1,2,4,7)
moles[102]=new Array(6,6,1,4)
atoms[103]=new Array(1,2,19,4)
moles[103]=new Array(2,3,1,2)
atoms[104]=new Array(1,2,4)
moles[104]=new Array(3,8,1)
atoms[105]=new Array(1,2,4)
moles[105]=new Array(7,8,2)
atoms[106]=new Array(9,33,4)
moles[106]=new Array(2,1,3)
//Symbols and gaws for 34 common elements
gaws=new Array(10)
gaws[1]=new element("C",12)
gaws[2]=new element("H",1)
gaws[3]=new element("N",14)
gaws[4]=new element("O",16)
gaws[5]=new element("F",19)
gaws[6]=new element("Cl",35.45)
gaws[7]=new element("S",32)
gaws[8]=new element("Br",80)
gaws[9]=new element("Na",23)
gaws[10]=new element("Fe",55.85)
gaws[11]=new element("Si",28.1)
gaws[12]=new element("Mg",24.3)
gaws[13]=new element("Cr",52)
gaws[14]=new element("Li",6.94)
gaws[15]=new element("P",30.97)
gaws[16]=new element("Al",26.98)
gaws[17]=new element("B",10.81)
gaws[18]=new element("Ag",107.87)
gaws[19]=new element("K",39.1)
gaws[20]=new element("I",126.9)
gaws[21]=new element("Zn",65.4)
gaws[22]=new element("Cs",132.9)
gaws[23]=new element("Pb",207.2)
gaws[24]=new element("Sn",118.7)
gaws[25]=new element("Ca",40.1)
gaws[26]=new element("Hg",200.6)
gaws[27]=new element("Ni",58.7)
gaws[28]=new element("Cu",63.55)
gaws[29]=new element("Ba",137.3)
gaws[30]=new element("Co",58.9)
gaws[31]=new element("Mn",54.94)
gaws[32]=new element("Mo",95.94)
gaws[33]=new element("Se",78.96)
gaws[34]=new element("Pd",106.4)
symbols=new Array()
symbols=new Array("moles of compound","grams of compound")
function startit(){
	clear()
	totl++
	document.forms[0].total.value=totl
	//choose compound,total mass,moles and make arrays of components and masses
	//choice=Math.ceil(Math.random()*atoms.length)
	choice++
	cmpd=buildformula()
	symbols[0]=new Array(("moles of "+cmpd),("grams of "+cmpd))
	gfw=getgfw()
	alldata=new Array()
	alldata[0]=new Array(cmpd,1,gfw)
	themass=0
	while(themass<.1)themass=100*Math.random();
	themoles=themass/gfw
	alldata[0][4]=number(themass,3,3)
	alldata[0][3]=number(themoles,3,3)
	//masses of component elements
	for(var j=1;j<=atoms[choice].length;j++){
		key=atoms[choice][j-1]
		alldata[j]=new Array()
		alldata[j]=new Array(gaws[key].atom,moles[choice][j-1])
		alldata[j][2]=number(gaws[key].mass*moles[choice][j-1],3,3)
		alldata[j][3]=number(alldata[0][3]*moles[choice][j-1],3,3)
		alldata[j][4]=number(alldata[j][3]*gaws[key].mass,3,3)
	}
	for(j=1;j<alldata.length;j++)symbols[j]=new Array(("moles of "+alldata[j][0]),("grams of "+alldata[j][0]))	
	buildquest()
}
function buildformula(){
	cmpd=""
	for(var j=0;j<atoms[choice].length;j++){
		var key=atoms[choice][j]
		cmpd+=gaws[key].atom
		if(moles[choice][j]!=1)cmpd+="<sub>"+moles[choice][j]+"</sub>";
	}
	return cmpd
}
function getgfw(){
	gfw=0
	for(var j=0;j<atoms[choice].length;j++){
		var key=atoms[choice][j]
		gfw+=moles[choice][j]*gaws[key].mass
	}
	return gfw
}
function buildquest(){
	first=Math.ceil(Math.random()*atoms[choice].length);
	second=first
	while(second==first)second=Math.ceil(Math.random()*atoms[choice].length);
	second=first
	while(second==first)second=Math.floor(Math.random()*atoms[choice].length);
	key1=Math.floor(2*Math.random())
	if(key1==0)key2=first;
	else{
		Math.random()>.5?key2=0:key2=second;
	}
	opt1=Math.floor(2*Math.random())
	opt2=Math.floor(2*Math.random())
	thequest="A sample of "+alldata[0][0]+" contains "+alldata[key1][3+opt1]+labels[opt1]+" of "+alldata[key1][0]+". How many "+labels[opt2]+" of "+alldata[key2][0]+" are present?<br>"
	theanswr=alldata[key2][3+opt2]
	checkdata=alldata[key1][0]+","+alldata[key1][3+opt1]+"<br>"
	checkdata+=alldata[key2][0]+","+alldata[key2][3+opt2]
	showquest(thequest)
	buildanswer()
}
function buildanswer(){
	theeqn=buildequation()
	theanswer=ansphrase[0]+"<b>"+symbols[key1][opt1]+"</b> and<b> "+symbols[key2][opt2]+"</b>"
	theanswer+=ansphrase[2]+"<hr>"+theeqn
}
function buildequation(){
	theeqn="From the formula for "+alldata[0][0]+"<br>"
	theeqn+="("+symbols[key2][opt2]+closeit[0]+" &#247; ("+symbols[key1][opt1]+closeit[0]+" &#215; ("+symbols[key1][opt1]+closeit[1]+" = ("+symbols[key2][opt2]+closeit[1]+"<br>"
	theeqn+=" ("+alldata[key2][1+opt2]+" &#247; "+alldata[key1][1+opt1]+") &#215; "+alldata[key1][3+opt1]+" = "+alldata[key2][3+opt2]+labels[opt2]
	return theeqn
}
			
function answer(ans){
	if(tried==1)alert("You've done this one! Get a new problem.")
	else{
	attempts++
	if(tried==2){totl++;document.forms[0].total.value=totl}
	if (ans>.95*theanswr & ans<1.05*theanswr){
    		document.forms[0].results.value="correct"
		corrt++
    		document.forms[0].correct.value=corrt
		tried=1
	}
	else {
		document.forms[0].results.value="incorrect"
		tried=2
	}
	}
}