All categories

3 years ago

What is the frequency of light that has a wavelength of 10.0 nm?

Chemistry

1 answer:

Arturiano [62]3 years ago

8 0

ν is the frequency.

c is the speed of light.

λ is the wavelength.

$ν = \frac{c}{λ} \\ \\ ν = \frac{299792458 \: ms {}^{ - 1} }{10 \times 10 {}^{ - 9} \: m } \\ \\ ν = 2.997924580 \times 10 {}^{16} s {}^{ - 1} \\ \\ ν≅3 \times 10 {}^{16} Hz$

You might be interested in

What is the mass of 4.2 mol of the element iron (Fe)?Answer in units of g.

lbvjy [14]

Answer:

2.35 *10^2 g

Explanation:

4.2 mol Fe *55.845 g/1 mol = 234.549 > 2.35 *10^2 g

8 0

3 years ago

When 2.714 g of AX (s) dissolves in 127.4 g of water in a coffee-cup calorimeter the temperature rises from 23.3 °C to 37.1 °C.

MakcuM [25]

Answer : The enthalpy change for the solution is 166.34 kJ/mol

Explanation :

First we have to calculate the enthalpy change of the reaction.

Formula used :

$\Delta H=mC\Delta T\\\\\Delta H=mC(T_2-T_1)$

where,

$\Delta H$ = change in enthalpy = ?

C = heat capacity of water = $4.18J/g.K$

m = total mass of sample = 2.174 + 127.4 = 129.6 g

$T_1$ = initial temperature = $23^oC=273+23=296K$

$T_2$ = final temperature = $37.1^oC=273+37.1=310.1K$

Now put all the given values in the above expression, we get:

$\Delta H=mC(T_2-T_1)$

$\Delta H=129.6g\times 4.18J/g.K\times (310.1-296)K=7638.36J$

Now we have to calculate the moles of AX added to water.

$\text{ Moles of }AX=\frac{\text{ Mass of }AX}{\text{ Molar mass of }AX}=\frac{2.714g}{59.1097g/mole}=0.04592moles$

Now we have to calculate the enthalpy change for the solution.

As, 0.04592 moles releases heat = 7638.36 J

So, 1 moles releases heat = $\frac{7638.36}{0.04592}=166340.59J=166.34kJ$

Therefore, the enthalpy change for the solution is 166.34 kJ/mol

7 0

3 years ago

Why is fluorine a gas?

mart [117]

Answer:

In fluorine, the electrons are tightly held to the nuclei. The electrons have little chance to wander to one side of the molecule, so the London dispersion forces are relatively weak. At a low enough temperature the molecules will all be solids. At a high enough temperature they will all be gases.

7 0

3 years ago

Read 2 more answers

How many moles of CO are produced when 1.8 moles C reacts?

olasank [31]

Answer:

1.44mole of CO

Explanation:

The reaction equation is given as:

5C + 2SO₂ → CS₂ + 4CO

We check to see if the expression is balanced and it is so;

Now;