27.9L
Explanation:
Given parameters:
Number of molecules = 7.5 x 10²⁴molecules
Condition = STP
Unknown:
Volume of gas = ?
Solution;
The volume of gas at STP is expressed below;
Volume of gas = number of moles x 22.4
Number of moles = 
Now if we can obtain the value of the number of moles from the expression above, we can plug it back into the equation of the volume of gas at STP;
Number of moles of NH₃ = ![\frac{[tex]7.5 x 10^{24}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Btex%5D7.5%20x%2010%5E%7B24%7D)
}{6.02 x 10^{23} }[/tex]
Number of moles of NH₃ = 12.5moles
Volume of gas = 12.5 x 22.4 = 27.9L
learn more:
Volume of gas at STP brainly.com/question/7795301
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Al, since it is the only metal in that list
Answer: Option (a) is the correct answer.
Explanation:
A dissociation reaction is defined as the reaction in which a compound beaks down into two or more different parts.
For example, molecular formula of water is 
and when it dissociates then it given hydrogen ion and hydroxide ion.
Therefore, dissociation reaction for water is as follows.
Thus, we can conclude that out of the given options is the correct equation for the dissociation of water.
Mass of KMnO4 required : 31.607 g
<h3>Further explanation
</h3>
The reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Reaction
2KMnO₄ → K₂MnO₄ + MnO₂ + O₂
mol of O₂ :
mol ratio KMnO₄ : O₂ = 2 : 1
mol of KMnO₄ :
mass of KMnO₄ :
MW KMnO₄ : 158,034 g/mol
