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Tomtit [17]
3 years ago
10

A sample of the alloy “electrum” is 62% silver and 38% gold by mass; mass of part/

Chemistry
1 answer:
Tanzania [10]3 years ago
5 0

Answer:

c

Explanation:

edge 2022

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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

And, the moles are  0.031 moles

So, the mass of NaCL is

= 0.031 \times 58.44

= 1.811 g

We simply applied the above formulas

3 0
3 years ago
Why is current more dangerous than voltage?
Serga [27]
The higher the current, the more likely it is lethal. Since current is proportional to voltage when resistance is fixed (ohm's law), high voltage is an indirect risk for producing higher currents.
6 0
3 years ago
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What is the composition and percentage of the gases in earths atmosphere?
olasank [31]

Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere.

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Plants get all their matter from soil. True or False
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False

Explanation:

Not all of it but some of it. Hope this helps! (ノ◕ヮ◕)ノ*:・゚✧

8 0
3 years ago
Explain how scientists learned about the magnetic poles of the Earth.
Oxana [17]

Answer:

ocean basalts

Explanation:

As the sea floor slowly spreads, the igneous rock(ocean basalts) of which it is comprised cools and congeals, recording the earth's current magnetic pole alignment.

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3 years ago
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