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2 years ago

What volume will 20.0g of Argon occupy at STP?

1 answer:

6 0

Molar mass Argon = 39.948 g/mol

1 mol ------ 39.948 g
mol ----- 20.0 g

mol = 20.0 * 1 / 39.948

= 0.5006 moles

1 mol --------------------- 22.4 L ( at STP )
0.5006 moles ------------- L

L = 0.5006 * 22.4

= 11.21 L

hope this helps!

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Answer:

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2 years ago

The molecules of a substance must have what characteristics in order to be flexible

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Answer:
The molecules of a substance which must have the ability to move past one another are said to be flexible.

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2 years ago

The rock in a lead ore deposit contains 89 % PbS by mass. How many kilograms of the rock must be processed to obtain 1.5 kg of P

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Explanation:

Relative atomic mass data from a modern periodic table:

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S: 32.06.

To answer this question, start by finding the mass of Pb in each kilogram of this rock.

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$\displaystyle n = \frac{m}{M} = \rm \frac{890}{239.26} = 3.71980\; mol$ .

There's one mole of $\rm Pb$ in each mole of $\rm PbS$ . There are thus $\rm 3.71980\; mol$ of $\rm Pb$ in one kilogram of this rock.

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