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2 years ago

What is the molar mass of the unknown gas?

Chemistry

1 answer:

vovangra [49]2 years ago

4 0

First the ideal gas law will be used to solve for the moles of unknown gas (n). Then the mass of the gas divided by the moles will give the molar mass. Step 2: Solve. Now divide g by mol to get the molar mass.

Hope that helps!!!

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HELP!!!!!!!!!!! *What are some of the safety concerns for Barium sulfate & Barium Sulfide? Explain

Alex

BaSO₄ is relatively harmless, but BaS is highly toxic.

BaSO₄ is quite insoluble (240 µg/100 mL). It is a mild irritant in cases of skin contact and inhalation. However, it is safe enough that health professionals ask patients to drink a suspension of BaSO₄. The Ba is opaque to X-rays, so it makes the stomach and intestines more visible to radiographers.

BaS is soluble (7.7 g/100 mL). It reacts slowly with water and more rapidly in the acid conditions of the stomach to release H₂S.

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3 0

2 years ago

Which element has the highest thermal conductivity

Vera_Pavlovna [14]

Answer:

Diamond.

Explanation:

Having thermal conductivity of more than 2,000 WMK

WMK = Watts per Meter per Kelvin

3 0

3 years ago

(23.4m)(14m) rounded off to the correct number of significant figures

VARVARA [1.3K]

The value of the given expression up to correct significant figures is $330 m^2$ .

The rule that applies for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The rule that applies for the addition and subtraction is :

The least precise number present after the decimal point determines the number of significant figures in the answer.

Given:

The expression: (23.4m)(14m)

To find:

The answer up to correct a number of significant figures.

Solution

Number of significant figures in '23.4' = 3

Number of significant figures in '14' = 22

$=(23.4m)(14m)\\=(23.4m)\times (14m)\\=327.6 m^2$

The number with the least significant figures is '14' is 2, so the answer will be reported up to 2 significant figures:

$=327.6 m^2\approx 330 m^2$

Number of significant figures in '330' = 3

The value of the given expression up to correct significant figures is $330 m^2$ .

Learn more about significant figures here:

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5 0

2 years ago

Combustion of ethylene glycol leads to a change in internal energy (\DeltaU) of –1189 kJ at 298 K. What is the corresponding cha

ddd [48]

Answer:

-1190.24 kJ

Explanation:

The enthalpy change in a chemical reaction that produces or consumes gases is given by the expression:

ΔH = ΔU + Δngas RT

where Δn gas is the change of moles of gas, R is the gas constant,and T is temperature.

Now from the given balanced chemical reaction, the change in number of mol gas is equal to:

Δn gas = mole gas products - mole gas reactants = 2 - 5/2 = -1/2 mol

Sionce we know ΔU and the temperature (298 K), we are in position to calculate the change in enthalpy.

ΔH = -1189 x 10³ J + (-0.5 mol ) 8.314 J/Kmol x 298 K

ΔH = -1.190 x 10⁶ J = -1.190 x 10⁶ J x 1 kJ/1000 J = -1.190 x 10³ J

7 0

3 years ago

Consider the following unbalanced reaction: P4(s) + F2(g) → PF3(g) What mass of fluorine gas is needed to produce 120. g of PF3

Studentka2010 [4]

Answer:

44.28 grams.

Explanation:

Let us write the balanced reaction:

$P_{4}+6F_{2}-->4PF_{3}$

As per balanced equation, six moles of fluorine gas will give four moles of PF₃.

The mass of PF₃ required = 120 g

The molar mass of PF₃ = 88g/mol

Moles of PF₃ required = $\frac{mass}{molarmass}=\frac{120}{88}=1.364mol$

The moles of fluorine gas required = $\frac{4X1.364}{6}=0.91$

the mass of fluorine gas required = moles X molar mass = 0.91x38 = 34.58g

Now this much mass will be required if the reaction is of 100% yield

But as given that the yield of reaction is only 78.1%

The mass of fluorine required = $\frac{massX100}{78.1} =\frac{34.58X100}{78.1} =44.28g$

4 0

2 years ago