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sweet-ann [11.9K]
4 years ago
6

aluminum has a density of 2.70 g/ml. calculate the mass (in grams) of a piece of aluminum having a volume of 250 ml .

Chemistry
1 answer:
Inga [223]4 years ago
6 0
Per ml, aluminum has 2.7 grams of mass. So in 250 ml, there are (2.7)*(250) number of grams.

675 grams. 
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Air has a mass of 1.2g and a volume of 4,555ml. What is the density
coldgirl [10]

Answer:

<h2>Density = 0.00026 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

<h3>Density(\rho) =  \frac{mass}{volume}</h3>

From the question

mass of air = 1.2 g

volume = 4,555 mL

Substitute the values into the above formula and solve for the density

That's

<h3>Density =  \frac{1.2}{4555}</h3>

= 0.0002634

We have the final answer as

<h3>Density = 0.00026 g/mL</h3>

Hope this helps you

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To learn more about the genetic material of plant and animal cells, where would a person look?
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is which shell are the valence electrons of the elements in period 2 found
8 0
3 years ago
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A solution is prepared by mixing 25.0 g H2O and 25.0 g C2H5OH. Determine the mole fractions of each substance.
Veronika [31]

Answer:

Mole fraction H₂O → 0.72

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By the mass of the two elements in the solution, we determine the moles of each:

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Mole fraction solvent = Moles of solvent / Total moles

Total moles = Moles of solute + Moles of solvent

1.39 moles of solute + 0.543 moles of solvent = 1.933 moles → Total moles

Mole fraction H₂O = 1.39 / 1.933 → 0.72

Mole fraction C₂H₅OH= 0.543 / 1.933 → 0.28

Remember that sum of mole fractions = 1

8 0
3 years ago
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Serhud [2]

Answer:

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2H₂(g) + CO(g) → CH₃OH(g)

From the balanced chemical equation, we can see that 1 mol of CO reacts wIth 2 moles of H₂. So, the stoichiometric ratio is:

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We have 500 mol of CO and 750 mol of H₂, so we calculate the ratio to establish a comparison:

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8 0
3 years ago
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