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3 years ago

What is the Wavelength of the frequency of 1.54 Hz

Chemistry

1 answer:

julsineya [31]3 years ago

4 0

Answer:

$\lambda=1.94\times 10^8\ m$

Explanation:

Given that,

The frequency of a wave, f = 1.54 Hz

We need to find the wavelength of the wave.

The relation between wavelength, frequency and speed is given by :

$c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{1.54}\\\\\lambda=1.94\times 10^8\ m$

So, the wavelength of the wave is $1.94\times 10^8\ m$ .

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If you have 120. mL of a 0.100 M TES buffer at pH 7.55 and you add 3.00 mL of 1.00 M HCl, what will be the new pH? (The pKa of T

Simora [160]

Answer:

The new pH after adding HCl is 7.07

Explanation:

The formula for calculating pH of a buffer is

pH = pKa + log([Conjugate base]/[Acid])

Before adding HCl,

7.55 = 7.55 + log([Conjugate base]/[Acid])

⇔ log([Conjugate base]/[Acid]) = 0

⇔ [Conjugate base] = [Acid] = 1/2 x 0.100 = 0.05 M

⇒ Mole of Conjugate base = Mole of Acid = 0.05 M x 0.12 mL = 0.006 mol

After adding HCl (3.00 mL, 1.00 M)

⇒ Mole of HCl = 0.003 x 1 = 0.003 mol)

New volume solution is 120 m L+ 3 mL = 123 mL

HCl is a strong acid, it will convert the conjugate base to acid form, or we can express

Mole of new Conjugate base = 0.006 - 0.003 = 0.003 mol

⇒ Concentration = 0.003/0.123 M

Mole of new Acid form = 0.006 + 0.003 = 0.009 mol

⇒ Concentration = 0.009/0.123 M

Use the formula

pH = pKa + log([Conjugate base]/[Acid])

= 7.55 + log(0.003 / 0.009) = 7.07

8 0

3 years ago

Assign the oxidation state for all the atoms: As2O3 Show work

Sonja [21]

Answer: Oxidation state of Arsenic in the given compound is +3 and that of oxygen is -2.

Explanation:

We are given a compound having formula $As_2O_3$ and we need to find the oxidation state of all the atoms in this compound. There are 2 different atoms present in this : Arsenic and Oxygen

Oxidation state is the number which is assigned to an element in a compound which represents the number of electrons lost or gained by an atom in a compound.

Oxidation state of oxygen as -2 which is same always. Now, to calculate the oxidation state of Arsenic, we take the oxidation state of it be 'x'

As, there are two arsenic atoms and three oxygen atoms, then:

$\Rightarrow 2(x)+3(-2)=0\\\Rightarrow 2x-6=0\\\Rightarrow x=+3$

Hence, oxidation state of Arsenic in the given compound is +3 and that of oxygen is -2.

3 0

4 years ago

The molar heat capacity for carbon monoxide at constant volume is CV,m = 20.17 J/(K·mol). A 3.00-L fixed-volume flask contains C

kompoz [17]

ΔS = 0.250 J·K^(-1)

Step 1. Calculate the moles of CO

From the Ideal Gas Law,

n = (pV)/(RT) = (8.00 kPa × 3.00 L)/(8.314 kPa·L·K^(-1)·mol^(-1) × 298.15 K)

= 0.009 682 mol

ΔS = nC_Vln(T_2/T1)

= 0.0096 82 mol × 20.17 J·K^(-1)mol^(-1) ln(1073.15 K/298.15 K)

= 0.1953 J·K^(-1) × ln3.599 = 0.250 J·K^(-1)

5 0

3 years ago

How many bonds can sodium form

Tresset [83]

it exists as atom or ion but not as sodium molecule. So there is no any sodium sodium bonding between two sodium atoms. Sodium combines with other element or group to form compounds of sodium like sodium chloride ,sodium carbonate ,sodium sulphate etc. Sodium has symbol Na and its atomic no. is 11 .

4 0

3 years ago

Read 2 more answers

In the lab, ammonia was mixed with water to form ammonium hydroxide. What is/are the reactant(s)?

Nataly_w [17]

The reactants are what is put into the reaction equation to get the product. In this case water and ammonia are put into the equation to get the product ammonium hydroxide.

The first choice is the correct answer:

Water and ammonia

Hope this helped!

~Just a girl in love with Shawn Mendes

7 0

3 years ago

Read 2 more answers