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3 years ago

Which physical property can be measured??

Chemistry

2 answers:

Scorpion4ik [409]3 years ago

5 0

Answer:

Density for Edge

Explanation:

Density is the only choice that has a numerical answer.

Nikitich [7]3 years ago

4 0

Extensive property (like volume and mass), can be measured.

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What is the final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L

sineoko [7]

Answer: The final concentration of a solution is 0.350 M

Explanation:

According to the dilution law,

$C_1V_1=C_2V_2$

where,

$C_1$ = concentration of concentrated acid solution = 12.0 M

$V_1$ = volume of concentrated acid solution = 35.0 ml

$C_2$ = concentration of diluted acid solution= ?

$V_2$ = volume of another acid solution= 1.20 L = 1200 ml

( 1L=1000ml)

Putting in the values:

$12.0\times 35.0=C_2\times 1200$

$C_2=0.350M$

The final concentration of a solution prepared by diluting 35.0 mL of 12.0 M HCl to a final volume of 1.20 L is 0.350 M

8 0

3 years ago

Which of the following is the best example of a closed system?

Marat540 [252]

Based on my information, this would be known to be a "green house" as this, would be as it would be a house known for planting, and etc. But the main part that I wanted to consider would be the fact that it would also be a "closed system" as you would be able to open and close this kind of machine.

Your answer: a greenhouse

3 0

3 years ago

Read 2 more answers

Someone plss help me ASAP

Crank

Answer:

Explanation:

You add the two numbers on the bottom left (8 and 32) and then subtract the number On the bottom middle right (22) from it (40-22=18) and then the answer to that gives you the answer of how much water is produced.

hope that helped :)

8 0

3 years ago

Although coal is a complex mixture of substances, its elemental composition can be approximated by the formula <img src="https:/

Svetllana [295]

Answer:

The correct answer is option b.

Explanation:

$2C_{135}H_{96}O_9NS+313O_2\rightarrow 270CO_2+2NO_2+2SO_2+96H_2O$

Mass of coal burned = $1.00\times 10^6$ metric ton = 1.00\times 10^6\times 10^3 kg=10^9 kg[/tex]

1 metric ton = $10^3kg$

Molar mass of coal :

$135\times 12g/mol+96\times 1g/mol+9\times 16 g/mol+1\times 14 g/mol+1\times 32 g/mol=1906 g/mol=1.906 kg/mol$

1 g = 0.001 kg

Moles of coal ,n : $\frac{10^9 kg}{1.906 kg/mol}=5.247\times 10^8 mol$

If 2 moles of coal on combustion gives 270 moles of carbon dioxide than n moles of coal will give;

$5.247\times 10^8 mol\times \frac{270}{2}=7.083\times 10^{10} mol$ of carbon dioxide.

Molar mass of carbon dioxide gas = 44 g/mol = 0.044 kg/mol

Mass of $7.083\times 10^{10} mol$ of carbon dioxide:

$7.083\times 10^{10} mol\times 0.044 kg/mol=3.11\times 10^{11} kg$

5 0

4 years ago

A student dissolves of styrene in of a solvent with a density of . The student notices that the volume of the solvent does not c

raketka [301]

Answer:

0.576M and 0.655m

Explanation:

<em>...Dissolves 15.0g of styrene (C₈H₈) in 250.mL of a solvent with a density of 0.88g/mL...</em>

<em />

Molarity is defined as moles of solute (Styrene in this case) per liter of solution whereas molality is the moles of solute per kg of solvent. Thus, we need to find the moles of styrene, the volume in liters of the solution and the mass in kg of the solvent as follows:

<em>Moles styrene:</em>

Molar mass C₈H₈:

8C = 12.01g/mol*8 = 96.08g/mol

8H = 1.005g/mol* 8 = 8.04g/mol

96.08g/mol + 8.04g/mol = 104.12g/mol

Moles of 15.0g of styrene are:

15.0g * (1mol / 104.12g) = 0.144 moles of styrene

<em>Liters solution:</em>

250mL * (1L / 1000mL) = 0.250L

<em>kg solvent:</em>

250mL * (0.88g/mL) * (1kg / 1000g) = 0.220kg

Molarity is:

0.144 moles / 0.250L =

Molality is:

0.144 moles / 0.220kg =

8 0

3 years ago