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Lelechka [254]
4 years ago
7

How do I find the mass number of a ionic formula?

Chemistry
1 answer:
julsineya [31]4 years ago
6 0
So you add the individual mass of each individual element times the subscript ( no subscript= 1 )
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At STP, adding salt to a 200 mL sample of water produces a saturated 1.7 M solution. How many grams of salt (NaCl) must be added
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Answer:

m_{NaCl}=19.9gNaCl

Explanation:

Hello!

In this case, since the formula for the calculation of molarity is:

M=\frac{n}{V}

Whereas we can compute the moles of the solute as shown below, making sure the volume is in liters:

n=M*V

Thus, by plugging in we obtain:

n=0.200L*1.70mol/L=0.170molNaCl

Next, since the molar mass of NaCl is 58.44 g/mol, we obtain the following mass:

m_{NaCl}=0.170molNaCl*\frac{58.44gNaCl}{1molNaCl}\\\\m_{NaCl}=19.9gNaCl

Best regards!

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