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1 answer:
Answer:
1) Starting boiling point is 100°C
Explanation: Boiling point is a constant temperature. At 10 minutes, substance L boils constantly at 100°C till 14 minutes.
2) The temperature of substance L steadily increases from 0 to 8 minutes. Then it is constant from 10 to 14 minutes.
3). Substance L is a pure substance. Substance L is pure water because pure water boils at 100°C
e):
Substance L is Water
Reason: Substance L has boiling point of 100°C as well as water
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Taking into account the definition of density, the mass of a substance with a volume of 150 cm³ and a density of 1.5 is 225 grams.
Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
<h3>Mass of the substance in this case</h3>In this case, you know that:
- Density= 1.5
- Volume= 150 cm³
Replacing in the definition of density:
Solving:
mass= 1.5 ×150 cm³
<u><em>mass= 225 g</em></u>
In summary, the mass of a substance with a volume of 150 cm³ and a density of 1.5 is 225 grams.
Learn more about density:
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Answer : The minimum amount of 6.9 M needed is, 2.0 L
Explanation :
The given chemical reaction is:
First we have to calculate the moles of
Molar mass of = 2 g/mol
Now we have to calculate the moles of
From the balanced chemical reaction we conclude that,
As, 3 moles of produced from 3 moles of
So, 13.9 moles of produced from 13.9 moles of
Now we have to calculate the mass of
Thus, the minimum amount of 6.9 M needed is, 2.0 L
Answer:
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Explanation:
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