Does a physical change make a new substance

Find the wavelength of a photon of light with energy of 9.02x10^-19 J.

vitfil [10]

Answer:

2.21 x 10⁻⁷m⁻¹

Explanation:

Given parameters:

Energy of the photon = 9.02 x 10⁻¹⁹J

Unknown:

Wavelength of the photon = ?

Solution;

The wavelength and energy of a photon are related using the expression below;

E = $\frac{hc}{wavelength}$

h is the Planck's constant = 6.63 x 10⁻⁴m²kg/s²

c is the speed of light

E is the energy

h c = E x wavelength

Wavelength = $\frac{hc}{E}$ = $\frac{6.63 x 10^{-34} x 3 x 10^{8} }{9.02 x 10^{-19} }$

Wavelength = 2.21 x 10⁻⁷m⁻¹

8 0

3 years ago

Calculate the molar mass for Cr2(SO3)3. Be sure to include units. Number: Units:

Vlad1618 [11]

Answer:

344.21 g/mol

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic Table

Explanation:

Step 1: Define

Cr₂(SO₃)₃

Step 2: Identify

Molar Mass of Cr - 52.00 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of O - 16.00 g/mol

Step 3: Find

Molar Mass of Cr₂(SO₃)₃ - 2(52.00) + 3(32.07) + 9(16.00) = 344.21 g/mol

3 0

3 years ago

A 2 mole sample of F2(g) reacts with excess NaOH(aq) according to the equation above. If the reaction is repeated with excess Na

77julia77 [94]

Answer:

The amount of NaF produced is doubled.

(d) is correct option.

Explanation:

Given that,

A 2 mole sample of F₂ reacts with excess NaOH according to the equation.

The balance equation is

$2F_{2}+2NaOH\Rightarrow 2NaF +H_{2}O+OF_{2}$

If the reaction is repeated with excess NaOH but with 1 mole of F₂

The balance equation is

$F_{2}+2NaOH\Rightarrow 2NaF +2OH$

Hence, The amount of NaF produced is doubled.

(d) is correct option.

6 0

3 years ago

When a monatomic ideal gas expands at a constant pressure of 6.4 x 105 Pa, the volume of the gas increases by 3.2 x 10-3 m3. Det

defon

Answer:

5118.50 J

Explanation:

pΔv=nRΔT ;

therefore, ΔT=PV/nR

ΔT = (6.4×10^5)(3.2×10^(-3)/1×8.314

ΔT= 2.4633×10^2 = 246.33 K

specific heat at constant pressure is given as:

c_p = 3/2R

c_p = 12.5 J/mol K

Now, substitute in equation (1)

we know that

Q=ΔU+W ;

and

W=pΔV= 6.4×10^5×3.2×10^(-3) = 2048 J

now

ΔU=CvΔT = 12.465×246.33 =3070.50 J ;

therefore

Q=3070.50+2048= 5118.50 J

4 0

3 years ago

A soft drink contains 12.1% sucrose (C12H22O11) by mass. What volume of the soft drink solution in milliliters contains 102.5 g

galina1969 [7]

The volume of the soft drink solution in milliliters that contains 102.5 g of sucrose is 11.93mL.

<h3>How to calculate volume?</h3>

The volume of a solution can be calculated by dividing the mass by the density. That is;

Volume = mass/density

According to this question, a soft drink contains 12.1% sucrose (C12H22O11) by mass. This means that the mass of the sucrose is

12.1/100 × 102.5 = 12.40g of sucrose

Volume = 12.40g ÷ 1.04g/mL

Volume = 11.93mL

Therefore, the volume of the soft drink solution in milliliters that contains 102.5 g of sucrose is 11.93mL.

Learn more about volume at: brainly.com/question/1578538

4 0

2 years ago