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Kazeer [188]
3 years ago
14

If you could measure the mass of the substances inside the cup before and after the reaction, you would see that the mass decrea

sed over a course of the reaction. Explain the difference.
Chemistry
2 answers:
Shalnov [3]3 years ago
8 0
Gases may have formed during the reaction, released into the air, thus lowering the mass after the reaction of the remaining products.
swat323 years ago
4 0
The difference is the mass of the gases that were formed during the reaction. If the cup is open, it is always the case that the gas would escape. Any reaction that forms a gas as a product is called a gas forming reaction. 
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3 years ago
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5 0
3 years ago
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How many moles of chloride ions are there in 2.5 L of 5 M magnesium chloride?
castortr0y [4]

Answer:

n_{Cl^-}=25molCl^-

Explanation:

Hello,

In this case, since the given 5-M concentration of magnesium chloride is expressed as:

5\frac{molMgCl_2}{L}

We can notice that one mole of salt contains two moles of chloride ions as the subscript of chlorine is two, in such a way, with the volume of solution we obtain the moles of chloride ions as shown below:

n_{Cl^-}=5\frac{molMgCl_2}{L}*\frac{2molCl^-}{1molMgCl_2} *2.5L\\\\n_{Cl^-}=25molCl^-

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