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3 years ago

How many moles are in 8.5 •10^25

Chemistry

1 answer:

Bess [88]3 years ago

7 0

You need the chemical to find the answer

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What is the purpose of a buffer?

Brums [2.3K]

Answer:

To limit pJ changes in solution

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4 years ago

Why is the mixture of the titration of potassium permanganate solution using oxalic acid heated before titration?

alexgriva [62]

Explanation:

During titration of oxalic acid and $KMnO_4$ in acid medium to reaction is extremely slow. Since $KMnO_4$ is acting as a self indicator the colour disappears after less than 30s even after approaching equivalent point. So the reaction mixture is heated to approximately 70– $80^0 C$ (just before it starts boiling) and the titration is started. This helps in initiating the reaction via supplying the necessary activation energy of the reaction. Secondly the heat helps to decompose $[Mn(C_2O_4)^3]^{-3}$ complex which forms as a result of local excess of $KMnO_4$ .the complex is unstable above $60^0C$ and the $Mn^{+2}$ formed as a result catalyses the rest of the reaction. Thirdly the temp should never exceed the range given as oxalic acid will decompose above this temp to $Co_2$

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4 years ago

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Calcium + zinc nitrate ------->

Snezhnost [94]

Answer:

Explanation:

there will be displacement reaction taking place

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3 years ago

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a) how to prepare a verbal report

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3 years ago

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10 atoms of aluminum reacts with 6 molecules of oxygen gas to produce aluminum oxide. 4 Al + 3 O2 ––> 2 Al2O3 What is the exc

Mrrafil [7]

The excess reactant is Aluminum.

<u>Explanation:</u>

We have to write the balanced equation as,

4 Al+ 3 O₂ → 2 Al₂O₃

According to the molar ratio 4: 3, from the given balanced equation, we can say that 4 atoms of Al reacted with 3 molecules of oxygen.

Given that 10 atoms of aluminum reacts with 6 molecules of oxygen, as per the ratio only 8 atoms of Aluminum is required to react with 6 molecules of oxygen, so excess reactant is Aluminum.

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4 years ago