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kupik [55]
3 years ago
11

A 2 mL sample of concentration 0.0043 M is measured out with a volumetric pipet and diluted to 100.0 mL. What is the concentrati

on (in M) for this solution? Give your numerical answer to three significant figures and leave off the unit label.
Chemistry
1 answer:
Vsevolod [243]3 years ago
7 0

Answer:

Explanation:

The dilution formula is

s₁ v₁ = s₂ v₂

s₁ = .0043

v₁= 2 mL

v₂ = 100 mL

s₂ = ?

putting the values

.0043 x 2 = s₂ x 100

s₂ = .000086 = 86.0 x 10⁻⁶

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What is the percentage of water in the hydrate CoCl2 • 6H2O? Show your work.
Lelu [443]
Hello!

First you have to find the molar mass of the molecules

C = 12
O = 16
2Cl = 71
6H2O = 108

Add them up to find the total molar mass

12 + 16 + 71 + 108 = 207g/mol

Divide the amount of water by the total molar mass

108 / 207 = 0.5217

Convert this to a decimal

0.5217 = 52.17%

The answer is 52.17%

Hope this helps!
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Answer:

A)

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B)

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Explanation:

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Explanation:

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