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MA_775_DIABLO [31]
3 years ago
8

Calculate the mass of MgCO3 (84.31 g/mol) precipitated by mixing 10.0 mL of a 0.300 M Na2CO3 solution with 6.00 mL of 0.0400 M M

g(NO3)2 solution.
Chemistry
1 answer:
I am Lyosha [343]3 years ago
7 0

Answer:

m_{MgCO_3}=0.0202molMgCO_3

Explanation:

Hello,

In this case, for this purpose we first have to write the undergoing chemical reaction:

Na_2CO_3+Mg(NO_3)_2\rightarrow MgCO_3+2NaNO_3

Thus, since the mole ratio between the reactants is 1:1, we next identify the limiting reactant by computing the available moles of sodium carbonate and those moles of the same reactant consumed by the magnesium nitrate considering the given solutions:

n_{Na_2CO_3}=0.010L*0.300\frac{molNa_2CO_3}{1L}=0.003molNa_2CO_3 \\\\n_{Na_2CO_3}^{consumed}=0.006L*0.0400\frac{molMg(NO_3)_2}{1L}*\frac{1molNa_2CO_3}{1molMg(NO_3)_2} =0.00024molNa_2CO_3

In such a way, since less moles are consumed, we can say that the sodium carbonate is excess whereas the magnesium nitrate is the limiting one, therefore, the yielded mass of magnesium carbonate turns out:

m_{MgCO_3}=0.00024molMg(NO_3)_2*\frac{1molMgCO_3}{1molMg(NO_3)_2}*\frac{84.31gMgCO_3}{1molMgCO_3}  \\\\m_{MgCO_3}=0.0202molMgCO_3

Regards.

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