UnbelievableDreams
  • UnbelievableDreams
I need help with Chemistry
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!
UnbelievableDreams
  • UnbelievableDreams
Carbonates react with acids to form a salt, water and carbon dioxide gas. When 58.2 g of calcium carbonate are reacted with sufficient hydrochloric acid, how many grams of calcium chloride will be produced?
aaronq
  • aaronq
Start by writing an equation for the reaction and balancing it
Photon336
  • Photon336
1 I agree with arronq the first step is to write out your balanced equation ensuring that the number of atoms are the same on both sides of your reaction. 2.Then you find how many moles of the compound you have and multiply that by your molar ratio.

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UnbelievableDreams
  • UnbelievableDreams
CaCO3 + 2HCl = CaCl2 + H2O + CO2 Is it correct?
Photon336
  • Photon336
That's good
UnbelievableDreams
  • UnbelievableDreams
How do I find the moles?
Photon336
  • Photon336
58.2g CaCO3 x (1mol/molar mass g) To figure out the number of mole when given the grams is to take the number of grams and multiply it by 1/(molar mass) of your compound. So you find the molar mass of your compound which is 100 g. so for this compound it means that every mole of this substance has 100grams. Now 58.2g CaCO3 x (1mol/100 g) = mol caco3 So two things. You notice that the grams cancel out because you are multiplying g x (1/g) which cancel out and you're left with moles of CaCO3 The reason why you needed to balance the equation, was that to get how many grams of product you would need to multiply by the molar ratio.
Photon336
  • Photon336
So knowing this how would you find the miles of calcium chloride?
Photon336
  • Photon336
"Moles""
UnbelievableDreams
  • UnbelievableDreams
So the moles of calcium chloride is 0.582?
Photon336
  • Photon336
Correct now Look at the molar ratio of CaCl2 to CaCO3 You want to do this because multiplying by the molar ratio will tell you how many mol of a product are produced
UnbelievableDreams
  • UnbelievableDreams
It is 1:1? So the answer is 0.582?
Photon336
  • Photon336
0.582 mol CaCO3 x (CaCl2/CaCO3) We're looking for mole of CaCl2 produced, so that's why we multiplied CaCO3 by the molar ratio and you're left with moles of CaCO3 = 0.582 mol CaCl2 x (111g/mol) = grams of CaCl2 So like I said before in your calculations the molar ratio is important because if you set it up correctly your denominators cancel and your left with the unit that you WANT in this case CaCl2. My advice loop up dimensional analysis because it will help you do these types of problems.
Photon336
  • Photon336
Be careful to always do the math out because your ratio won't always be 1:1
UnbelievableDreams
  • UnbelievableDreams
Now, I understand. I have few questions that I need help.
Photon336
  • Photon336
Great

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