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iren2701 [21]
2 years ago
13

.Put 8.4 x 10^-6 into standard notation.

Chemistry
1 answer:
Murrr4er [49]2 years ago
5 0

Answer:

.0000084

Explanation:

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820 g Li2SO4 is dissolved into 2500 mL of solution. What is the molar concentration?
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Molarity is defined as the moles of solute per liter of solution. M=\frac{n}{V}. Where M is molarity, n is the number of moles and V is the volume. First we must find the molar mass of Li_2SO_4 which is 109.98 g/mol

Li_2SO_4= 2 \times Li_{Ar} + S_{Ar} + 4 \times O_{Ar}\\= (2 \times 6.941 + 32.1 + 4 \times 16.0) = 109.98 g/mol

820\ g\ Li_2SO_4 \times \frac{mol}{109.98\ g}= 7.46\ mol\ Li_2SO4

Then we find the molarity using above equation

M= \frac{n}{V} = \frac{7.46 mol}{2500ml} \times\frac{1000ml}{L} = 2.98\ M


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