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2 years ago

How do very dry areas of the world become habitable

Chemistry

2 answers:

BaLLatris [955]2 years ago

3 0

Well some animals can survive in the dry land because they don't grow up by water

Solnce55 [7]2 years ago

3 0

Create a reservoir for recreation or drinking water. You can also use this water for generating electric power.

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Which of these is found inside the solar system?

Trava [24]

the answer would be B) Moon

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3 years ago

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What should I do if I have a friend who i talk to everyday and I like him but he doesn’t like me?

azamat

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3 years ago

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How many molecules of sodium nitrate are produced when 40 g of sodium azide, NaN3, react with oxygen?

quester [9]

NaN 3 + AgNO 3 AgN 3 + NaNO 3

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2 years ago

3. A student carries out the clay-catalyzed dehydration of cyclohexanol starting with 10 moles of cyclohexanol and obtains 500 m

IrinaK [193]

Answer:

$49.45~%$

Explanation:

In this case, we have to start with the chemical reaction:

$C_6H_1_2O~->~C_6H_1_0~+~H_2O$

So, if we start with 10 mol of cyclohexanol ( $C_6H_1_2O$ ) we will obtain 10 mol of cyclohexanol ( $C_6H_1_0$ ). So, we can calculate the grams of cyclohexanol if we calculate the molar mass:

$(6*12)+(10*1)=82~g/mol$

With this value we can calculate the grams:

$10~mol~C_6H_1_0\frac{82~g~C_6H_1_0}{1~mol~C_6H_1_0}=820~g~C_6H_1_0$

Now, we have as a product 500 mL of $C_6H_1_0$ . If we use the density value (0.811 g/mL). We can calculate the grams of product:

$500~mL\frac{0.811~g}{1~mL}=405.5~g$

Finally, with these values we can calculate the yield:

$%~=~\frac{405.5}{820}x100~=~49.45%$ %= (405.5/820)*100 = 49.45 %

See figure 1

I hope it helps!

6 0

3 years ago

Which measurement has the greatest number of significant figures?

soldi70 [24.7K]

Answer:

Option B = 60,600 mg (correct option)

Explanation:

First of all we will have an idea which numbers are consider as significant.

1 = All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

2= Leading zeros are not consider as a significant figures. e.g. 0.02 in this number only one significant figure present which is 2.

3= Zero between the non zero digits are consider significant like 105 consist of three significant figures.

4= The zeros at the right side e.g 3400 are also significant. There are four significant figures are present.

In given options, Option A 60.6 mg have 3 significant figures.

Option B have 5 significant figures.

Option C have 4 significant figures.

Option D have 3 significant figures.

Thus option b is correct option which have more significant figures.

3 0

3 years ago