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3 years ago

Calculate the following question

Chemistry

1 answer:

valkas [14]3 years ago

6 0

Answer:

[H₃O⁺] → 0.063 M

Explanation:

To determine the pH, our formula is:

- log [H₃O⁺]

To determine the [H⁺] we have to apply the inverse function

10^-pH = [H₃O⁺]

10⁻¹'²⁰ = [H₃O⁺] → 0.063 M

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4 years ago

The decomposition of dinitrogen pentoxide, N2O5, to NO2 and O2 is a first-order reaction. At 60°C, the rate constant is 2.8 × 10

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Answer:

a. 113 min

Explanation:

Considering the equilibrium:-

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At t = 0 125 kPa

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Thus, total pressure = 125 - 2x + 4x + x = 125 - 3x

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Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

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$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Given that:

The rate constant, k = $2.8\times 10^{-3}$ min⁻¹

Initial concentration $[A_0]$ = 125 kPa

Final concentration $[A_t]$ = 91 kPa

Time = ?

Applying in the above equation, we get that:-

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3 years ago

At which temperature do the molecules of an ideal gas have 3 times the kinetic energy they have at 32of?

algol [13]

Answer:

820 K

Explanation:

As per Boltzman equation, kinetic energy (KE) is in direct relation to the temperature, measured in absolute scale Kelvin.

KE α T.

Then, the temperature at which the molecules of an ideal gas have 3 times the kinetic energy they have at any given temperature will be 3 times such temperature.

So, you must just convert the given temperature, 32°F, to kelvin scale.

You can do that in two stages.

First, convert 32°F to °C. Since, 32°F is the freezing temperature of water, you may remember that is 0°C. You can also use the conversion formula: T (°C) = [T (°F) - 32] / 1.80

Second, convert 0°C to kelvin:

T (K) = T(°C) + 273.15 K= 273.15 K

Then, 3 times gives you: 3 × 273.15 K = 819.45 K

Since, 32°F has two significant figures, you must report your answer with the same number of significan figures. That is 820 K.

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3 years ago

Calculate the following question​

Calculate the following question