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Author Topic: Need help on this question please  (Read 763 times)
Sarah12345
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« on: July 02, 2009, 11:34:10 AM »

What mass (g) of AgBr is formed when 35.5 mL of 0.184 M AgNO3 is treated with an excess of aqueous hydrobromic acid (HBr)?
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kyle1990
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« Reply #1 on: July 02, 2009, 12:35:08 PM »

It's often helpful to write out the chemical equation to see what's going on:

AgNO3 + HBr ----> AgBr + HNO3

How many moles of AgNO3 are reacting? (Hint: since there is an "excess" of HBr added, the limiting reagent is AgNO3, thus, however many moles of AgNO3 there are, that's how many moles of AgBr are produced).
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« Reply #2 on: July 02, 2009, 12:36:41 PM »

Write a balanced equation for the reaction
HBr + AgNO3 ---> AgBr + HNO3
          1 mole        1 mole

So find the number of moles of AgNO3 using Volume in L x M
You can then see that the same number of moles of AgBr will be formed. (*)
Then find what 1 mole of AgBr weighs (approx 108+80 = 188g)
Then find what the calculated number of moles (*) weigh
« Last Edit: July 02, 2009, 12:38:31 PM by kingchemist » Logged

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