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3 years ago

A sound wave has a frequency of 20 Hz and a wavelength of 100 m. What is speed of the wave

Chemistry

1 answer:

marshall27 [118]3 years ago

4 0

The speed of a wave can be calculated using this formula:

v = f x λ

Where:

v is the wave speed in metres per second, m/s

f is the frequency in hertz, Hz

λ (lambda) is the wavelength in metres, m

Calculation:

Given:

f = 20 Hz

λ = 100m

Using the equation:

v = f x λ

v = 20 x 100

v = 2000 m/s

Therfore, the speed of the wave is 2000 m/s

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The rate constant for the second-order reaction 2NOBr(g) ¡ 2NO(g) 1 Br2(g) is 0.80/M ? s at 108C. (a) Starting with a concentrat

Valentin [98]

Answer:

(a)

$0.0342M$

(b)

$t_{1/2}=17.36s\\t_{1/2}=23.15s$

Explanation:

Hello,

(a) In this case, as the reaction is second-ordered, one uses the following kinetic equation to compute the concentration of NOBr after 22 seconds:

$\frac{1}{[NOBr]}=kt +\frac{1}{[NOBr]_0}\\\frac{1}{[NOBr]}=\frac{0.8}{M*s}*22s+\frac{1}{0.086M}=\frac{29.3}{M}\\$

$[NOBr]=\frac{1}{29.2/M}=0.0342M$

(b) Now, for a second-order reaction, the half-life is computed as shown below:

$t_{1/2}=\frac{1}{k[NOBr]_0}$

Therefore, for the given initial concentrations one obtains:

$t_{1/2}=\frac{1}{\frac{0.80}{M*s}*0.072M}=17.36s\\t_{1/2}=\frac{1}{\frac{0.80}{M*s}*0.054M}=23.15s$

Best regards.

8 0

3 years ago

Read 2 more answers

A sample of a gas in a rigid container at 35.0oC and 1.85 atm has its temperature increased to 48oC. What will be the new pressu

Scorpion4ik [409]

Answer:

Standard pressure is always 1.00atm. Example #1: How many moles of oxygen will occupy a volume of 2.50 L at STP? Standard temperature = 273K law.

Explanation:

8 0

2 years ago

A substance that can behave as either an acid or a base is: anthocyanin a neutral substance an indicator an amphiprotic substanc

s2008m [1.1K]

Answer:

These substances are called amphiprotic. Water, amino acids, hydrogen carbonate ions, and hydrogen sulfate ions are common examples.

Explanation:

A substance is amphoteric (from Greek amphoteros = "each of two") if it can act as an acid or a base.

For example, aluminum hydroxide is amphoteric because it can act as a base and neutralize strong acids.

5 0

2 years ago

How many molecules are contained in 1.55 moles of methane, CH 4 ?

Korolek [52]

Avogadro's law states that in one mole of a substance, there are $6.022 \times 10^{23}$ molecules.

This means that in 1.55 moles, there are $1.55(6.022 \times 10^{23})=\boxed{9.33 \times 10^{23} \text{( to 3 sf)}}$

5 0

2 years ago

A balloon is filled with a gas and has a volume of 1.79 L at 2.82 atm pressure. What will its volume be if

Black_prince [1.1K]

Answer:

<h2>The answer is 0.95 L</h2>

Explanation:

In order to find the volume when the pressure is changed to 5.30 atm we use Boyle's law which is

$P_1V_1 = P_2V_2 \\$

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

$V_2 = \frac{P_1V_1}{P_2} \\$

From the question

P1 = 2.82 atm

V1 = 1.79 L

P2 = 5.30 atm

So we have

$V_2 = \frac{2.82 \times 1.79}{5.3} \\ = 0.9524150943...$

We have the final answer as

Hope this helps you

6 0

3 years ago