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Kisachek [45]
3 years ago
13

Which of the following is true about lava and magma? A Lava and magma are both types of molten rock. B Magma uses waves to break

down lava over time. C When magma cools and hardens it becomes lava. D Magma is called lava when it’s below the Earth’s surface.
Chemistry
1 answer:
Gre4nikov [31]3 years ago
4 0

Answer:

a

Explanation:

magma is lava and lava is magma

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olya-2409 [2.1K]
<span>B) solute... solvent... solution</span>
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Calculate the mass of arsenic trihydride produced from 117.4 g of hydrogen gas with excess arsenic trioxide:
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Answer: The mass of AsH_3 produced is, 1528.8 grams.

Explanation : Given,

Mass of H_2 = 117.4 g

Molar mass of H_2 = 2 g/mol

First we have to calculate the moles of H_2.

\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}

\text{Moles of }H_2=\frac{117.4g}{2g/mol}=58.7mol

Now we have to calculate the moles of AsH_3

The balanced chemical equation is:

6H_2+As_2O_3\rightarrow 2AsH_3+3H_2O

From the reaction, we conclude that

As, 6 moles of H_2 react to give 2 moles of AsH_3

So, 58.7 moles of H_2 react to give \frac{2}{6}\times 58.7=19.6 mole of AsH_3

Now we have to calculate the mass of AsH_3

\text{ Mass of }AsH_3=\text{ Moles of }AsH_3\times \text{ Molar mass of }AsH_3

Molar mass of AsH_3 = 78 g/mole

\text{ Mass of }AsH_3=(19.6moles)\times (78g/mole)=1528.8g

Therefore, the mass of AsH_3 produced is, 1528.8 grams.

6 0
3 years ago
Iron-59 has a half-life of 44 days. a radioactive sample has an activity of 0.64 mbq. what is the activity of the sample after 8
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Radioactive decay is a pseudo-first order reaction. When you know the half-life of the material, you could use this equation.

A= A₀(1/2)^t/h
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Explanation:

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Answer:

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because they are in group one

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