maddisonGruby
  • maddisonGruby
okay so i have 2 questions pertaining to stoichiometry, is anyone willing to help. i will fan and medal
Chemistry
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
maddisonGruby
  • maddisonGruby
maddisonGruby
  • maddisonGruby
@escamer are you good with chem?
escamer
  • escamer
im sorry but i dont know this ;-;

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maddisonGruby
  • maddisonGruby
its cool, but thanks for looking
escamer
  • escamer
np :)
anonymous
  • anonymous
Ok, so first, do you know the order of conversions?
maddisonGruby
  • maddisonGruby
no im not familiar with that, i just started this class @snackshack79
anonymous
  • anonymous
alright, I'm fairly new to this too. the order of conversions is going to be grams > moles > moles > grams
maddisonGruby
  • maddisonGruby
okay so like i have to turn grams to moles, and back?
anonymous
  • anonymous
real quick, how much do you already understand? do you understand the cross cancellation that has to take place?
maddisonGruby
  • maddisonGruby
yeah, i know that, and i know i have to make the chart. i also know Tripotassium phosphate (K3PO4) has a Molar mass approx: 212.27 g/mol
anonymous
  • anonymous
well lets focus on the first one first
anonymous
  • anonymous
do you know what to start with?
maddisonGruby
  • maddisonGruby
okay so for that one, i need to make the chart that looks like this right?|dw:1449600517184:dw|
anonymous
  • anonymous
well, I Learned it a bit differently first your going to need to start with 42.0 g Na2O
maddisonGruby
  • maddisonGruby
and thats the molar mass?
anonymous
  • anonymous
so do you know how to convert it to moles?
maddisonGruby
  • maddisonGruby
yes. i can convert to moles
anonymous
  • anonymous
alright, how?
maddisonGruby
  • maddisonGruby
42 g Na2O x (1 mol Na2O / 62 g) = 0.6774 mol Na2O, 62 is the molar mass, of the compound
maddisonGruby
  • maddisonGruby
this is where i got stuck
anonymous
  • anonymous
alright, that looks good so far, but there's going to be more to the equation. next we need to convert from moles of sodium oxide to moles of sodium
anonymous
  • anonymous
so this step is going to be (x mol Na / y mol Na2O)
anonymous
  • anonymous
do you know what x and y are going to be?
maddisonGruby
  • maddisonGruby
y is gonna be 0.6774 mol Na2O right?
anonymous
  • anonymous
nope, the x and y values are both in your balanced equation
maddisonGruby
  • maddisonGruby
4 and 2?
anonymous
  • anonymous
exactly!!!
maddisonGruby
  • maddisonGruby
and we multiply by the .6774?
anonymous
  • anonymous
so, so far we have: 42 g Na2O x (1 mol Na2O / 62 g) (x mol Na / y mol Na2O) we are going to need to multiply in one more of these fractions, and then we'll be done
anonymous
  • anonymous
oops, sorry, I meant: 42 g Na2O x (1 mol Na2O / 62 g) (4 mol Na / 2 mol Na2O) so, now we're going to convert it back to grams, this time grams of sodium (Na)
maddisonGruby
  • maddisonGruby
0.6774 mol Na2O x (4 mol Na / 2 mol Na2O) = 1.3548 mol Na, i think
maddisonGruby
  • maddisonGruby
and that 1.3548 mole is 31.16 grams of Na
anonymous
  • anonymous
alright, that looks good, but I'm going to need to see that last step between moles of Na and grams of Na
maddisonGruby
  • maddisonGruby
31.16 grams of sodium?
anonymous
  • anonymous
alright, what is the fraction you used to get 31.16?
maddisonGruby
  • maddisonGruby
do you want me to be honest? i just put 1.3548 mol converted to grams in google
anonymous
  • anonymous
alright, that's fine, but your going to need to know this conversion: x g Na / 1 mol Na
anonymous
  • anonymous
any idea what replaces the x?
maddisonGruby
  • maddisonGruby
so 42g Na/ 1 mol Na?
anonymous
  • anonymous
no, for any conversion between grams and moles, there will be 1 mol, and the grams will be the molar mass of the molcule
maddisonGruby
  • maddisonGruby
ohhhh so......23 g?
anonymous
  • anonymous
yep, so can we put the whole equation together, so we can solve the whole thing?
maddisonGruby
  • maddisonGruby
this is what i got on my paper, convert the 42 g of Na2O into mol. 42 g Na2O x (1 mol Na2O / 62 g) = 0.6774 mol Na2O how many mol Na are needed to produce 0.6774 mol Na2O. 0.6774 mol Na2O x (4 mol Na / 2 mol Na2O) = 1.3548 mol Na convert the mol Na into grams. 1.3548 mol Na x (23g Na / 1 mol Na) = 31.16 grams Na therefore, 31.16 grams of Na are needed to produce 42.0 grams of Na2O. is this correct?
anonymous
  • anonymous
Perfect!!!
maddisonGruby
  • maddisonGruby
so can you help me as i go through the last one?
anonymous
  • anonymous
sure
maddisonGruby
  • maddisonGruby
wait! i just found something in my note book! 1 mole K2PO4 yields 3 moles KNO3
anonymous
  • anonymous
that's what the balanced equation is saying too
anonymous
  • anonymous
this one's easy, its just mole to mole
maddisonGruby
  • maddisonGruby
so do i multiply that ratio by 2.5 to get my answer?
anonymous
  • anonymous
pretty much, but can you tell me the equation you're supposed to use?
maddisonGruby
  • maddisonGruby
ummm 2.5mol of Potassium phosphate (1 mole K3PO4/ 3 moles KNO3)
maddisonGruby
  • maddisonGruby
and you get 7.5 mol?
anonymous
  • anonymous
not quite, you got the right answer, but your fraction's upside down
maddisonGruby
  • maddisonGruby
so what should it look like?
anonymous
  • anonymous
2.5 mol K3PO4 ( 3 moles KNO3 / 1 mole K3PO4)
maddisonGruby
  • maddisonGruby
ohhh okay, thank you so much! and i may definitely be needing your help in the future
anonymous
  • anonymous
alright, if I'm on I'll certainly help you if you tag me

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