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nikitadnepr [17]
3 years ago
15

What is the molartity of 2 moles of a compound dissolved in 4 L of water

Chemistry
1 answer:
bogdanovich [222]3 years ago
4 0
Number of moles = 2 moles

Volume = 4 L

M = n / V

M = 2 / 4

M = 0,5 mol/L

hope this helps!
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What is the density of 19.2 g of oak that has a volume of 25.7 cm3?
andreyandreev [35.5K]

Density = Mass/Volume

19.2/25.7

= 0.747 or 0.75

7 0
3 years ago
A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is
Airida [17]

Answer:

the maximum safe operating temperature the engineer should recommend for this reaction is 616 °C  

Explanation:

Given the data in the question;

First we calculate the Volume of the steel cylinder;

V = πr²h

radius r = Diameter / 2 = 27 cm / 2 = 13.5 cm

height h = 32.4 cm

so we substitute

V = π × ( 13.5 cm )² × 32.4 cm

V  = π × 182.25 cm × 32.4 cm

V = 18550.79 cm³  

V = 18.551 L

given that; maximum safe pressure P = 3.10 MPa = 30.5946 atm

vessel contains 0.218kg or 218 gram of carbon monoxide gas

molar mass of carbon monoxide gas is 28.010 g/mol

so

moles of carbon monoxide gas n = 218 gram /  28.010 g/mol = 7.7829 mol

we know that;

PV = nRT

solve for T

T = PV / nR

we know that gas constant R = 0.0820574 L•atm•mol⁻¹ K⁻¹

so we substitute

T = ( 30.5946 × 18.551 ) / ( 7.7829 × 0.082 )

T = 567.5604 / 0.6381978

T = 889.317387 K

T = ( 889.317387 - 273.15 ) °C

T = 616.167 ≈ 616 °C  { 3 significant digits }

Therefore, the maximum safe operating temperature the engineer should recommend for this reaction is 616 °C  

6 0
2 years ago
Select ALL answers that apply to the total energy of a wave:
Verdich [7]

Answer:

(A) The shorter the wavelength, the more total energy the wave contains.

(B) The longer the wavelength, the less total energy the wave contains.

Explanation:

The wavelength (λ), frequency (f) and energy (E) are interrelated. This relationship between them is represented in the following equations:

λ = v/f and E = hf

Where;

λ = wavelength (m)

f = frequency (Hz)

E = energy (Joules)

v and h represents speed of light and Planck's constants respectively.

Combining both equations, E = hc/λ

This equation shows that ENERGY (E) is directly proportional to the frequency (f) but inversely proportional to the wavelength (λ). This means that "the shorter the wavelength, the more total energy a wave contains" and vice versa.

However, the higher the frequency, the more the total energy the wave contains and vice versa.

8 0
3 years ago
2
dexar [7]

Answer:

i do not know

Explanation:

6 0
2 years ago
How can the existence of spectra help to prove that energy levels in atoms exist?
Liula [17]
The existence of spectra can help the existence of atoms by expanding and multiplying in the law of London Dispersion
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