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3 years ago

Please i need the answer for 18,19,20Answer and I will give you brainiliest

Chemistry

1 answer:

dezoksy [38]3 years ago

8 0

Number 18 is correct, number 19 is the particles speed up and the substance expands, and number 20 is decrease in volume

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A 0.0200 m nacl solution was formed when 38.0 grams of nacl was dissolved in enough water. what was the total volume of the solu

Lostsunrise [7]

Total volume of the solution formed will be 32.5 liters

Given:

Molarity of solution = 0.0200 m

mass of nacl = 38.0 grams

To Find:

total volume of the solution

Solution: Molarity is defined as the amount of solute present in 1 L of solution. The equation used to determine molarity of the solution follows:

M = given mass of nacl/molar mass of nacl*1/volume of solution

volume of solution = given mass/molar mass*1/molarity

volume = 38/58.5*1/0.02 = 32.5

Hence, volume of solution = 32.5 litres

Learn more about Molarity here:

brainly.com/question/26873446

#SPJ4

3 0

2 years ago

A tactic used by investigators to identify deceit is to ask the suspect to recount their alibi backwards. True False

MA_775_DIABLO [31]

Answer:

It is True.

Explanation:

Investigators use this tactic to see if the suspect is recalling by memory and if they will change their story after being asked to recall backwards.

8 0

3 years ago

Read 2 more answers

The balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI is Pb(ClO3)2(aq)+2NaI(aq)⟶PbI2(s)+2NaClO3(aq) What

ryzh [129]

Answer : The mass of $PbI_2$ precipitate produced will be, 9.681 grams.

Explanation : Given,

Molarity of NaI = 0.210 M

Volume of solution = 0.2 L

Molar mass of $PbI_2$ = 461.01 g/mole

First we have to calculate the moles of $NaI$ .

$\text{Moles of }NaI=\text{Molarity of }NaI\times \text{Volume of solution}=0.210M\times 0.2L=0.042moles$

Now we have to calculate the moles of $PbI_2$ .

The balanced chemical reaction is,

$Pb(ClO_3)_2(aq)+2NaI(aq)\rightarrow PbI_2(s)+2NaClO_3(aq)$

From the balanced reaction we conclude that

As, 2 moles of $NaI$ react to give 1 mole of $PbI_2$

So, 0.042 moles of $NaI$ react to give $\frac{0.042}{2}=0.021$ moles of $PbI_2$

Now we have to calculate the mass of $PbI_2$ .

$\text{Mass of }PbI_2=\text{Moles of }PbI_2\times \text{Molar mass of }PbI_2$

$\text{Mass of }PbI_2=(0.021mole)\times (461.01g/mole)=9.681g$

Therefore, the mass of $PbI_2$ precipitate produced will be, 9.681 grams.

6 0

4 years ago

Heather ran 100 meters in 20 seconds. What is her speed? Just type the number, no labels.

3241004551 [841]

She ran at either 5m/s
Or 11.185 miles/hr

Explanation:
Aight well if she did 100m in 20s then that’s 5m/s which would also be 11.185M/h
m = meters
M = miles

Hope this helps!

4 0

2 years ago

Read 2 more answers

Nitrogen-7 configuration

11Alexandr11 [23.1K]

Explanation:

Electronic configuration of Nitrogen -

₇N = 1s² 2s² 2p³

5 0

4 years ago

Please i need the answer for 18,19,20Answer and I will give you brainiliest ​

Please i need the answer for 18,19,20Answer and I will give you brainiliest