Answer:
• → Mass = Volume × Density
• But density of water is 1000 kgm^-3
• Volume is 31.0 mL = 31.0 cm^3 = 0.000031 m³
Answer:
A. No photoelectrons < C. KE = 51 kJ·mol⁻¹ < B. KE = 155 kJ·mol⁻¹
632 nm < 455 nm < 325 nm
Explanation:
The equation for the photoelectric effect is
E = hf = Φ + KE
That is, the energy (hf) of the incident photon is used to eject an electron from the surface of the metal ( the work function, Φ), and anything left over goes into the kinetic energy (KE) of the electron.
1. Calculate the relative energies of the three wavelengths
E = hf
fλ = c or f = c/λ. So,
E = (hc)/λ
The energy is inversely proportional to the wavelength. Thus, the order of increasing energies is
632 nm < 455 nm < 325 nm
2. Assign the radiation to the observations.
Solve the photoelectric equation for KE.
E = Φ + KE
KE = E - Φ
If E < Φ, the light does not have enough energy to eject a photoelectron.
Once E > φ, the greater the value of E, the greater the value of KE.
The order of energies is
A. No photoelectrons < C. KE = 51 kJ·mol⁻¹ < B. KE = 155 kJ·mol⁻¹
632 nm < 455 nm < 325 nm
Answer:
Oxygen and Carbon Dioxide
Explanation:
Study Island
The enthalpy of the reaction can be obtained from the enthalpies of formation as -16.2 kJ/mol.
<h3>What is the enthalpy of reaction?</h3>
We know that any time that there is a chemical reaction, there is an interaction that place between the reactants and the products and as such we are going to get new substances and these are the substances that I have referred to here as the products of the reaction.
In this case, we are asked to obtain the enthalpy change of the reaction. This tells us the heat that could have been absorbed or evolved in the reaction. We have to at this point know that the enthalpy change of the reaction gotten from;
Sum of enthalpy of the products - Sum of enthalpy of the reactants
ΔH = [(-484.5)] - [(-393.5) + (-74.8)]
ΔH = (-484.5) + 468.3
ΔH = -16.2 kJ/mol
Learn more about enthalpy:brainly.com/question/3393755
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We have two unknowns for this problem. These are the amount of Ch4 and the amount of C2H6. We let these as x and y respectively. It should be that we generate two equation in order to solve this problem. We do as follows:
Equation 1:
x + y = 5
Equation 2
CO2 produced from CH4 + CO2 produced from C2H6 = 14.09
<span>x(44.01/16.05) + y(4)(44.01)/(2)(30.08) = 14.09
</span>2.74x +2.93y = 14.09
Solving simultaneously,
x = 2.95 g CH4
y= 2.05 g C2H6