Which of the following reactions Shows a chemical change producing a gas? APEX
2 answers:
Answer:
Explanation: A chemical change is a reaction in which chemical composition of the substance changes. Some bonds are broken and some new bonds are formed.
The reactants are written in terms of their chemical formula on the left hand side and the products are written in terms of their chemical formula on right hand side with a arrow in between. The chemical symbols are followed by their physical states such as (l) for liquid, (s) for solid, (g) for gas and (aq) for aqueous.
Thus the only reaction producing a gas is
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<u>Answer:</u> The mass of potassium sulfate that can be produced is 73.88 grams
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
- <u>For KOH:</u>
Given mass of KOH = 23.8 g
Molar mass of KOH = 56.1 g/mol
Putting values in equation 1, we get:
The chemical equation for the reaction of KOH and potassium hydrogen sulfate follows:
As, potassium hydrogen sulfate is present in excess. It is considered as an excess reagent.
KOH is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
1 mole of KOH produces 1 mole of potassium sulfate
So, 0.424 moles of KOH will produce = of potassium sulfate
Now, calculating the mass of potassium sulfate from equation 1, we get:
Molar mass of potassium sulfate = 174.26 g/mol
Moles of potassium sulfate = 0.424 moles
Putting values in equation 1, we get:
Hence, the mass of potassium sulfate that can be produced is 73.88 grams