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tatiyna
3 years ago
7

0.25 g na in moles please

Chemistry
1 answer:
enyata [817]3 years ago
4 0
What you need to do is find the Molar mass of sodium and then divide your mass (0.25g) by the molar mass of Na. 

Therefore   0.25g/22.9898g/mol (do you see how the "grams" unit will cancel out? That will leave you with the number of moles you have. 
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1 year ago
0.200 grams of HCl is dissolved in 0.801 grams water. The density of the solution formed is 1.10 g/mL. What is the molarity of t
alina1380 [7]

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Explanation:

Hello,

In this case, since the molarity is computed by:

M=\frac{n_{solute}}{V_{solution}}

Whereas the solute is the hydrochloric acid, we compute the corresponding moles with its molar mass (36.45 g/mol):

n_{solute}=0.200gHCl*\frac{1molHCl}{36.45gHCl} =0.00549molHCl

Next, since the solution contains both HCl and water, we compute the volume in liters by using its density:

V_{solution}=(0.200+0.801)g*\frac{1mL}{1.10g} *\frac{1L}{1000mL} =9.1x10^{-4}L

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Regards.

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