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2 years ago

11

Can somebody help please to balance those I couldn’t balance it

1 answer:

scZoUnD [109]2 years ago

6 0

Answer:

1.

(NH4)2Cr2O7——>Cr2O7+N2+4H2O

2.

6CO2+6H2O——>C6H12O6+6O2

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Why is tate langdon from ahs so hot

Olegator [25]

Answer:

hes actually kinda hot tho

Explanation:

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3 years ago

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Which of the following would be an example of basic research?

Nitella [24]

B) Morrison and Franscioni's research done to create the Frisbee.

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3 years ago

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When is the Sun directly overhead in the continental United States?

astra-53 [7]

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C.

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2 years ago

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Assume that silver and gold form ideal, random mixtures. Calculate the mass of pure Ag needed to cause an entropy increase of 20

KengaRu [80]

Answer:

$m_{Ag}=2,265.9g$

Explanation:

Hello!

In this case, since the definition of entropy in a random mixture is:

$\Delta S=-n_TR\Sigma[x_i*ln(x_i)]$

For this silver-gold mixture we write:

$\Delta S=-(n_{Au}+n_{Ag})R\Sigma[\frac{n_{Au}}{n_{Au}+n_{Ag}} *ln(\frac{n_{Au}}{n_{Au}+n_{Ag}} )+\frac{n_{Ag}}{n_{Au}+n_{Ag}} *ln(\frac{n_{Ag}}{n_{Au}+n_{Ag}} )]$

By knowing the moles of gold:

$n_{Au}=100g*\frac{1mol}{197g} =0.508mol$

It is possible to write the aforementioned formula in terms of the variable $x$ representing the moles of silver:

$20\frac{J}{mol}=-(0.508+x)8.314\frac{J}{mol*K} \Sigma[\frac{0.508}{0.508+x} *ln(\frac{0.508}{0.508+x} )+\frac{x}{0.508+x} *ln(\frac{x}{0.508+x} )]$

Which can be solved via Newton-Raphson or a solver software, in this case, I will provide you the answer:

$x=n_{Ag}=21.0molAg$

So the mass is:

$m_{Ag}=21.0mol*\frac{107.9g}{1mol}\\ \\m_{Ag}=2,265.9g$

Best regards!

3 0

2 years ago

324.55 cm - (6104.5 cm²/22.3 cm)

Ganezh [65]

Answer: 50.806 cm is the correct answer.

Explanation: First divide 6104.5 cm^2 by 22.3 cm.

$\frac{6104.5cm^2}{22.3cm} = 273.74 cm$

*Note: When dividing units, subtract the exponents, and when multiplying units simply add the exponents.

Then continue by subtracting 324.55 cm - 273.74 cm.

This should give you an answer of 50.806 cm.

3 0

1 year ago