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2 years ago

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What is the sign of the charge of an electron

1 answer:

oksian1 [2.3K]2 years ago

4 0

Answer:

Electrons have negative charge.

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30.0 mL of 0.20 M AgNO, are added to 100.0 mL of 0.10 M HCI in a thermally nsulated vessel. The following reaction takes place:

Harman [31]

Answer : The heat of this reaction of AgCI formed will be, 66.88 KJ

Explanation :

First we have to calculate the heat of the reaction.

$q=m\times c\times (T_{final}-T_{initial})$

where,

q = amount of heat = ?

$c$ = specific heat capacity = $4.18J/g.K$

m = mass of substance = 120 g

$T_{final}$ = final temperature = $22^oC=273+22=295K$

$T_{initial}$ = initial temperature = $22.8^oC=273+22.8=295.8K$

Now put all the given values in the above formula, we get:

$q=120g\times 4.18J/g.K\times (295.8-295)K$

$q=401.28J$

Now we have to calculate the number of moles of $AgNO_3$ and $HCl$ .

$\text{Moles of }AgNO_3=\text{Molarity of }AgNO_3\times \text{Volume of solution}$

$\text{Moles of }AgNO_3=0.20mole/L\times 0.03L=0.006mole$

$\text{Moles of }HCl=\text{Molarity of }HCl\times \text{Volume of solution}$

$\text{Moles of }HCl=0.10mole/L\times 0.1L=0.01mole$

Now we have to calculate the limiting reactant.

The balanced chemical reaction will be,

$AgNO_3+HCl\rightarrow AgCl+HNO_3$

As, 1 mole of $AgNO_3$ react with 1 mole of HCl

So, 0.006 mole of $AgNO_3$ react with 0.006 mole of HCl

From this we conclude that, $HCl$ is an excess reagent because the given moles are greater than the required moles and $AgNO_3$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of AgCl.

The given balanced reaction is,

$Ag^++Cl^-\rightarrow AgCl$

From this we conclude that,

1 mole of $Ag^+$ react with 1 mole $Cl^-$ to produce 1 mole of $AgCl$

0.006 mole of $Ag^+$ react with 0.006 mole $Cl^-$ to produce 0.006 mole of $AgCl$

Now we have to calculate the heat of this reaction of AgCI formed.

As, 0.006 mole of AgCl produced the heat = 401.28 J

So, 1 mole of AgCl produced the heat = $\frac{401.28}{0.006}=66880J=66.88KJ$

Therefore, the heat of this reaction of AgCI formed will be, 66.88 KJ

4 0

2 years ago

You have two cups one is 6cm and other 10cm with no measurement and you have to pour 8cm of water into the 10cm cup using the tw

Korolek [52]

Here’s one way to do it.

1. Fill the 6 cm cup.

2. Pour its contents into the 10 cm cup. This leaves 4 cm yet to be filled.

3. Refill the 6 cm cup and use it to fill the 10 cm cup. This leaves 2 cm in the 6 cm cup.

4. Empty the 10 cm cup and add the 2 cm from the 6 cm cup.

5. Refill the 6 cm cup.

6. Pour its contents into the 10 cm cup.

The 10 cm cup now contains 8 cm of water.

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Answer question number 7

schepotkina [342]

It should more likely be on the lower side like ph2-4 since it requires acidic soil

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Most people use the _____ for intercity travel

Lyrx [107]

If your options are
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the correct answer is private bus system

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Which of the following statements is true about what happens in all chemical reactions? A. The ways in which atoms are joined to

antoniya [11.8K]

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B.bonds are broken and new bonds are formed

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