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KengaRu [80]
3 years ago
6

What is the molarity of 90 g of LiF in 4 L of solution? (convert to moles and round answer to 2 decimals)

Chemistry
1 answer:
liubo4ka [24]3 years ago
8 0

Answer:

Explanation:

First of all, knowing the grams we can calculate the moles of LiF: 90g/25,939 mol/g = 3,47 mol

Knowing the moles, we can finally calculate the molarity: 3,47 mol/4 L= 8.67 * 10^-1 M  

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                    \Delta V_{c} = V \times 3 \times \alpha \times \Delta T

                                 = 100 cm^{3} \times 3 \times 23 \times 10^{-6} \times (31 - 20)^{o}C

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                                 = 0.0759 cm^{3}

Formula for increase in volume  of glycerine is as follows.

               \Delta V_{g} = V \times \beta_{g} \times \Delta T

                              = 100 cm^{3} \times 5.1 \times 10^{-4} 1/^{o}C \times (31 - 20)^{o}C

                              = 0.5610 cm^{3}

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                        \Delta V = \Delta V_{g} - \Delta V_{c}

                                     = (0.5610 - 0.0759) cm^{3}

                                     = 0.4851 cm^{3}

Thus, we can conclude that 0.4851 cm^{3} glycerin will spill out of the cup.

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