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Anni [7]
2 years ago
5

1) Which of the following is true about Earth’s plates?

Chemistry
2 answers:
tatyana61 [14]2 years ago
5 0

Answer:

a because the others whould cause earthquakes

Explanation:

Tanzania [10]2 years ago
4 0

Answer:

A

Explanation:

because i think is A (if is not im sorry )

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How many grams of Ca(NO3)2 are needed to make 25.0 g of a 15.0% Ca(NO3)2(aq)?
yarga [219]

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3.75 g.

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<em>mass percent is the ratio of the mass of the solute to the mass of the solution multiplied by 100.</em>

<em />

<em>mass % = (mass of solute/mass of solution) x 100.</em>

<em></em>

mass of calcium nitrite = ??? g,

mass of the solution = 25.0 g.

∴ mass % = (mass of solute/mass of solution) x 100

<em></em>

<em>∴ mass of solute (calcium nitrite) = (mass %)(mass of solution)/100</em> = (15.0 %)(25.0 g)/100 = <em>3.75 g.</em>

5 0
3 years ago
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