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can you tell me if that qu namber 2is corect

Can You Tell Me If That Qu Namber 2is Corect class=

Sagot :

If CuCl2 is dihydrate, the equation of the reaction should be:

2 Al + 3 CuCl2*2H2O → 3 Cu + 2 AlCl3 + 6 H2O

So the answer for number one is: 2 Al + 3 CuCl2*2H2O → 3 Cu + 2 AlCl3 + 6 H2O

Then, we should do the calculation to find out if question 2 is right:

Step 1 - Transform grams of Al and CuCl2*2H2O into moles using the following formula: mole = mass/molar mass

molar mass of Al = 26.981539

molar mass of CuCl2*2H2O = 170.48256 g/mol

mass of Al= 0.5/26.981539 = 0.018531189 moles

mass of CuCl2*2H2O = 3.5/170.48256 = 0.020529959

Step 2 - Use the equation proportion to find the limiting and excess reactant.

2 moles Al --- 3 moles CuCl2*2H2O

0.018531189 moles Al --- x moles CuCl2*2H2O

x = 0.027796788 moles of CuCl2*2H2O

2 moles Al --- 3 moles CuCl2*2H2O

x moles Al --- 0.020529959 moles CuCl2*2H2O

x = 0.013686639 moles of Al

As we can see, CuCl2*2H2O is the limiting reactant.

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