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3 years ago

Is the pressure, volume, and temperature of a gas are know, which can most likely be found by using the ideal gas law?

1 answer:

8 0

The molar amount of gas can most likely be found by using the ideal gas law. This is because the ideal gas law states pV = nRT. P, V, and T are the pressure, volume, and temperature, which are the known variables. The R stands for the Universal Constant of Gases; also known. Therefore, the unknown is n, the number of moles (molar amount) of gas, and so you would solve for n from the law.

Answer: A) The molar amount of gas

Credit to: @Edufirst

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When a pendulum swings, at which point is kinetic<br> energy highest:

Anna [14]

Answer:

Explanation:

3 0

3 years ago

A mysterious white powder could be powdered sugar (C12H22O11), cocaine (C17H21NO4), codeine (C18H21NO3), norfenefrine (C8H11NO2)

konstantin123 [22]

Answer: norfenefrine $(C_8H_{11}NO_2)$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-114.6-(-115.5)^0C=0.9^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte)

$K_f$ = freezing point constant = $1.99^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (ethanol)= $density\times volume=0.789g/cm^3\times 1.50cm^3=1.18g=1.18\times 10^{-3}kg$

Molar mass of unknown non electrolyte = M g/mol

Mass of unknown non electrolyte added = 82 mg = 0.082 g (1g=1000mg)

$0.9=1\times 1.99\times \frac{0.082g}{M g/mol\times 1.18\times 10^{-3}}kg}$

$M=154g/mol$

The molecular mass of norfenefrine $(C_8H_{11}NO_2)$ is near to 154 and thus the identity of the white powder is norfenefrine .

4 0

3 years ago

Has anyone done the chemical reactions lab in chemistry on k12?? can someone help me do it

nata0808 [166]

I can help
im doing it

4 0

3 years ago

If you had a mixture that was found to contain 1.05g SiO2, 0.69g Cellulose and 1.82g Calcium Carbonate. What percentage calcium

boyakko [2]

Percentage by mass = (mass of substance / total mass) x 100
= 1.82 / (1.05 + 0.69 + 1.82) x 100
= 51.1% if Calcium Carbonate

6 0

3 years ago

Nickel carbonyl decomposes to form nickel and carbon monoxide, like this:

Schach [20]

Answer: The value of the equilibrium constant for this reaction is $2.8\times 10^{-5}$

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

Moles of $Ni(CO)_4$ = $\frac{0.597g}{170.7g/mol}=0.0035moles$

Moles of $Ni$ = $\frac{12.7g}{58.7g/mol}=0.216moles$

Moles of $CO$ = $\frac{1.98g}{28.01g/mol}=0.071moles$

Volume of solution = 2.7 L

Equilibrium concentration of $Ni(CO)_4$ = $\frac{0.0035mol}{2.7L}=1.29\times 10^{-3}M$

Equilibrium concentration of $Ni$ = $\frac{0.216mol}{2.7L}=0.08M$

Equilibrium concentration of $CO$ = $\frac{0.071mol}{2.7L}=0.026M$

The given balanced equilibrium reaction is,

$Ni(CO)_4\rightleftharpoons Ni+4CO$

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[Ni]^1\times [CO]^4}{[Ni(CO_4]^1}$

Now put all the given values in this expression, we get :

$K_c=\frac{(0.08)^1\times (0.026)^4}{(1.29\times 10^{-3})^1}$

$K_c=2.8\times 10^{-5}$

Thus the value of the equilibrium constant for this reaction is $2.8\times 10^{-5}$

5 0

3 years ago