In #6, it says iron reacts with chlorine gas to from iron(III)chloride. So iron would be Fe and it says it reacts with chlorine so it would be Fe + Cl2(chlorine is diatomic). It also says they produce iron(III)chloride, so you put an arrow and then write FeCl3 because Fe has 3 valence electrons and chlorine has only one. You criss cross them and it comes out to be FeCl3. Then all you have to do is balance it. Hope this helps =)
Elaine, you have given an excellent description. If Jamie is able to understand the question from just your description, then you will receive credit. Let's see what she says. Good Job.
The question is mole to mole so you take .25 moles of KClO3 and you put it into the dimensional analysis. Then you find the mole ratio that will cross out mole of KClO3 from the .25 with O2 on top(3 moles of O2/2 moles of KClO3) and you just solve by multiplying whatever is on top and dividing by whatever is on the bottom of the dimensional analysis. I hope that helped too.
I hope this blog is serving its purpose. The object is to help each other. Everybody wins. Great job to everyone. Check teacherease to lookup points that you have received. Let me know if there is a problem.
Bianca, can you go into your profile and change it so that we can see your name when you post a comment? Right now it is just saying "rfkchem" but change it so that we see "Bianca" as the name that gets displayed. If you need specific instructions perhaps someone who reads this message will provide assistance for that. Thank you.
Number four is a stoichiometric calculation going from mass to mass. First you must balance the equation. Next, write down the mass of the first chemical which in this case is 8 grams of H2O using dimensional analysis. Then, find the molar mass of H2O and make sure you put the number of grams on the bottom so that it cancels out.(1 mol H2O/18 g H2O) Next, find the molar ratio of Hydrogen to H2O. Then the last step is to find the molar mass of Hydrogen. (2g H2/1 mol H2). Multiply the numbers on top and then divide the numbers on the bottom to get the number of grams of Hydrogen gas. I hope that helps and isn't confusing.
LJ Stonebridge, You can balance the equation by making Mg as a. and compound AgNO3 as b and Ag as c and Mg(NO3)2 as d. Remember then you list all the elements like: Mg: Ag: NO3: and then if you see the element in a, b, c, or d you write it out but dont forget the subscripts and coefficents Mg:1a+0b=0c+1d Ag:0a+1b=1c+0d NO3:0a+1b=0c+2d Then cross out the 0's and you get 1a=1d 1b=1c 1b=2d then you give a value to a variable like a is 2 2=1d d=2 1b=2d b=4 c=4 All your doing is substituting and then you plug it in the beggining remember 2 Mg + 4 AgNO3---> 4 Ag + 2 Mg(NO3)2 but in this case you can reduce it and you'll get: Mg+2AgNO3--->2Ag+Mg(NO3)2
2H2+O2--->2H2O 2H2 is unknown and 2H2O is known Marina, So 4grams of Hydrogen give 36 grams water ? Give 8 grams water Every 4 grams of hydrogen gives u water but how many grams gives you 8 grams of water!! Its lke a proportion 4/36 = x/8 so u do the bow tie method 8*4=32/36 and you get .8888888=) I hope this helps:)
This post was originally posted by LJ Stonebridge:
ReplyDelete"i am a little confused on how to find the grams of Fe3Cl2"
February 6, 2009 6:27 AM
This is number 6? What is the equation for this question?! I don't get it.
ReplyDeleteFor Jamie:
ReplyDeleteIn #6, it says iron reacts with chlorine gas to from iron(III)chloride. So iron would be Fe and it says it reacts with chlorine so it would be Fe + Cl2(chlorine is diatomic). It also says they produce iron(III)chloride, so you put an arrow and then write FeCl3 because Fe has 3 valence electrons and chlorine has only one. You criss cross them and it comes out to be FeCl3. Then all you have to do is balance it.
Hope this helps =)
i am confused on how to find the moles of O2
ReplyDeleteLJ,
ReplyDelete#1?
Elaine, you have given an excellent description. If Jamie is able to understand the question from just your description, then you will receive credit. Let's see what she says. Good Job.
ReplyDeleteyes #1
ReplyDeleteThank You =)
ReplyDeleteLJ,
The question is mole to mole so you take .25 moles of KClO3 and you put it into the dimensional analysis. Then you find the mole ratio that will cross out mole of KClO3 from the .25 with O2 on top(3 moles of O2/2 moles of KClO3) and you just solve by multiplying whatever is on top and dividing by whatever is on the bottom of the dimensional analysis. I hope that helped too.
LJ, if Elaine's post makes sense to you and it helped, please just respond somehow acknowledging the fact that she helped.
ReplyDeleteThank You this helps a lot
ReplyDeleteI hope this blog is serving its purpose. The object is to help each other. Everybody wins. Great job to everyone. Check teacherease to lookup points that you have received. Let me know if there is a problem.
ReplyDeleteThanks Elaine :) I got it. You are the best.
ReplyDeleteMr Grossman you are the best !!!
ReplyDeletei know that was random =]
Marina, thank you for the random compliment. Please try to keep those random outbursts to a minimum and use the blog for help. Thanks.
ReplyDeleteIm wonderin if I got number 4 right?
ReplyDeletewat did u put on #4? on the worksheet?
ReplyDeleteBianca, can you go into your profile and change it so that we can see your name when you post a comment? Right now it is just saying "rfkchem" but change it so that we see "Bianca" as the name that gets displayed. If you need specific instructions perhaps someone who reads this message will provide assistance for that. Thank you.
ReplyDeletei dont get how to balance this equation Mg+AgNO3---Ag+Mg(NO3)2
ReplyDeleteBianca,
ReplyDeleteNumber four is a stoichiometric calculation going from mass to mass. First you must balance the equation. Next, write down the mass of the first chemical which in this case is 8 grams of H2O using dimensional analysis. Then, find the molar mass of H2O and make sure you put the number of grams on the bottom so that it cancels out.(1 mol H2O/18 g H2O) Next, find the molar ratio of Hydrogen to H2O. Then the last step is to find the molar mass of Hydrogen. (2g H2/1 mol H2). Multiply the numbers on top and then divide the numbers on the bottom to get the number of grams of Hydrogen gas. I hope that helps and isn't confusing.
LJ Stonebridge,
ReplyDeleteYou can balance the equation by making Mg as a. and compound AgNO3 as b and Ag as c and Mg(NO3)2 as d. Remember then you list all the elements like:
Mg:
Ag:
NO3:
and then if you see the element in a, b, c, or d you write it out but dont forget the subscripts and coefficents
Mg:1a+0b=0c+1d
Ag:0a+1b=1c+0d
NO3:0a+1b=0c+2d
Then cross out the 0's and you get
1a=1d
1b=1c
1b=2d
then you give a value to a variable like a is 2
2=1d
d=2
1b=2d
b=4
c=4
All your doing is substituting
and then you plug it in the beggining remember
2 Mg + 4 AgNO3---> 4 Ag + 2 Mg(NO3)2
but in this case you can reduce it and you'll get:
Mg+2AgNO3--->2Ag+Mg(NO3)2
Bianca,
ReplyDeleteon the top go to dashboard then go to edit profile and type in ur name wherever it says to ite =)
This comment has been removed by a blog administrator.
ReplyDeleteI am having trouble with number 4 from the worksheet.
ReplyDeleteI already balanced the equation it comes out to be :
2H2 + O2 --> 2H2O
How can I convert it?
-Marina
Marina you 8.0g H20 = 2g H2 over 64g H2O =.25g H2
ReplyDelete2H2+O2--->2H2O
ReplyDelete2H2 is unknown and 2H2O is known
Marina,
So 4grams of Hydrogen give 36 grams water
? Give 8 grams water
Every 4 grams of hydrogen gives u water but how many grams gives you 8 grams of water!! Its lke a proportion
4/36 = x/8 so u do the bow tie method
8*4=32/36 and you get .8888888=)
I hope this helps:)
how do you know that 4 grams of H2 gives 36g of H2O?
ReplyDeleteyour answer is correct Christina, but I would like you to explain it using dimensional analysis:
ReplyDelete(8g H2O)(1mol H2O/18g H2O)(1mol H2 / 2mol H2O)(2g H2 / 1mol H2) = .888g of H2