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3 years ago

9

While analyzing a fingerprint, the forensic expert identified a ridge that had a short arm originating from it. Which ridge char

acteristic is this likely to be?

1 answer:

Diano4ka-milaya [45]3 years ago

7 0

The answer is spur, hope this helped (:

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Why are standards needed for measured quantities?

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Suppose you need to prepare 141.9 mL of a 0.223 M aqueous solution of NaCl. What mass of NaCl do you need to use to make the sol

Afina-wow [57]

Answer:

1.811 g

Explanation:

The computation of the mass need to use to make the solution is shown below:

We know that molarity is

$Molarity = \frac{Number\ of\ moles}{Volume\ in\ L}$

So,

$Number\ of\ moles = Molarity\ \times Volume\ in\ L$

$= 0.223\times 0.141$

= 0.031 moles

Now

$Mass = moles \times Molecualr\ weight$

where,

The Molecular weight of NaCl is 58.44 g/mole

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So, the mass of NaCL is

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We simply applied the above formulas

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