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3 years ago

5

an empty 250 milliliter beaker has a mass of 60 grams. When 100 milliliters of oil is added to the beaker, the total mass is 140

grams. the density of the oil is approimately

1 answer:

Romashka [77]3 years ago

7 0

Density=mass/volume
Density=140g/100ml
Density=14g/ml

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Ahat [919]

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Explanation :

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First we have to write into the two half-reactions.
Now balance the main atoms in the reaction.
Now balance the hydrogen and oxygen atoms on both the sides of the reaction.
If the oxygen atoms are not balanced on both the sides then adding water molecules at that side where the more number of oxygen are present.
If the hydrogen atoms are not balanced on both the sides then adding hydroxide ion $(OH^-)$ at that side where the less number of hydrogen are present.
Now balance the charge.

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Oxidation : $Br^-(aq)+6OH^-(aq)\rightarrow BrO_3^-(aq)+3H_2O(l)+6e^-$ .......(2)

Now multiply the equation (1) by 2 and then added both equation, we get the balanced redox reaction.

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2 years ago

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Ksivusya [100]

Answer:

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∴ 24g =1 mole of Mg contain 6.022×10^23 atom

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=4×6.022×10^23 atoms

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