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lorasvet [3.4K]
4 years ago
10

In a chemical reaction, the total mass of the reactants is 10.0 grams. after the reaction, the total mass of the products must b

e:
a. less than 10.0 grams.
b. exactly 10.0 grams.
c. exactly 20.0 grams.
d. more than 10.0 grams.
Chemistry
2 answers:
Korvikt [17]4 years ago
4 0
It must be exactly 10.0 grams..... law of conservation of mass
kirza4 [7]4 years ago
3 0

Answer:

The answer is B

Explanation:

The answer is exactly 10 grams because of the law of conservation of mass which states that for a closed system, the mass of the system must remain constant over time, hence the mass of the products formed after the reaction cannot increase nor decrease as this will violate the law stated earlier.

The above explanation proves the reason for option B. The remaining options suggest either an increase or a decrease in the mass of the product formed which is not possible.

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Number of Mg(OH)2 formula units in 7.40 moles of Mg(OH)2.
-Dominant- [34]
The answer is 4.45 × 10²⁴ units.

To calculate this, we will use Avogadro's number which is the number of units (atoms, molecules) in 1 mole of substance:
6.02 × 10²³ units per 1 mole

So, we need a proportion:
If 6.02 × 10²³ units are in 1 mole, how many units will be in 7.40 moles:
6.02 × 10²³ units : 1 mole = x : 7.40 moles

After crossing the products:
1 mole * x =  7.40 moles * 6.02 × 10²³ units
x = 7.40 * 6.02 × 10²³ units
x = 44.5 × 10²³ units = 4.45× 10²⁴ unit
5 0
3 years ago
Help me pleaseee. ty if you dooo :))
Lina20 [59]

\huge \fcolorbox{black}{red}{♛answer♛}

Hydrogen Fluoride / HF

\huge\sf\underline{\underline{\red{❥︎ Thanks}}}

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3 years ago
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Solnce55 [7]

Answer:

false

Explanation:

As we know that in sodium-potassium pump .          

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and  moving 2k+ inside the cells                        

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Hope this helps!
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