1. A student tried to solve the following problem by selecting the tile as shown. What, if anything,
2AgNO3 (aq) + Cu (s) — 2Ag (s) + Cu(NO3)2 (aq)
How many moles of silver nitrate (AgNO3) are
needed to produce 6.75 moles of copper (II) nitrate
(Cu(NO3)2) upon reacting with excess copper (Cu)?
6.75 mol Cu(NO3)2
1 mol Cu(NO3)2
2 mol AgNO3

Not sure sorry

Explanation:

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

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