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Stolb23 [73]
3 years ago
9

HELPPPPPP!!!! ILL MARK YOU BRAINLIEST!

Chemistry
1 answer:
Snowcat [4.5K]3 years ago
3 0
The answer is 20 because density = 100g/5cm
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madreJ [45]
The mass number of hydrogen is 2

The mass number of helium is 4

The mass number of boron is 7

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3 years ago
10.0 g of Mg(NO3)2 = ____ moles
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4 years ago
Glucose, C 6 H 12 O 6 , is used as an energy source by the human body. The overall reaction in the body is described by the equa
Rufina [12.5K]

Answer : The mass of O_2 required is, 61.82 grams.

Explanation :

First we have to calculate the moles of C_6H_{12}O_6

\text{Moles of }C_6H_{12}O_6=\frac{\text{Given mass }C_6H_{12}O_6}{\text{Molar mass }C_6H_{12}O_6}=\frac{58.0g}{180g/mol}=0.322mol

Now we have to calculate the moles of O_2.

The balanced chemical equation is:

C_6H_{12}O_6(aq)+6O_2(g)\rightarrow 6H_2O(l)+6CO_2(g)

From the balanced reaction we conclude that

As, 1 mole of C_6H_{12}O_6 react with 6 mole of O_2

So, 0.322 moles of C_6H_{12}O_6 react with 0.322\times 6=1.932 moles of O_2

Now we have to calculate the mass of O_2

\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2

Molar mass of O_2 = 32 g/mole

\text{ Mass of }O_2=(1.932moles)\times (32g/mole)=61.82g

Therefore, the mass of O_2 required is, 61.82 grams.

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3 years ago
Manny and Eva are dissolving sugar in 10 milliliters (mL) of water. They discover that more sugar dissolves in warmer water. In
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a

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3 point different between fundamental units and derived units<br>​
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Answer:

<u><em>Fundamental Units:</em></u>

1) Fundamental units also called base units are used to describe base quantities

2) They cannot be expressed in terms of derived units.

3)<u> Examples :</u> Meter, Ampere, Second etc.

<u><em>Derived Units:</em></u>

1) Derived units are used to describe derived quantities.

2) They can be expressed in terms of fundamental units.

3)<u> Examples: </u>Newton, Joule, Hertz, Pascal etc.

8 0
3 years ago
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