Explanation: Chemicals in the original manufacturer’s container that have been recently purchased from a supplier will most likely contain hazard information in the form of warnings and pictograms. Older manufacturer’s chemical containers may have alternative labeling schemes that provide essentially the same information as the new labels.
Answer:
4. 393.3 kJ/mol.
Explanation:
1. H2O(ℓ) → H2(g) + 1/2O2
∆H = 285.8 kJ/mol.
2. CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ)
∆H = −890.0 kJ/mol.
3. CH4(g) → Cgraphite(s) + 2H2(g)
∆H = 74.9 kJ/mol.
Flipping and then multiplying Equation 1. by 2,
2H2(g) + O2 → 2 H2O(ℓ)
∆H = -571.6 kJ/mol.
Note: ∆H sign changes.
CO2(g) + 2 H2O(ℓ) → CH4(g) + 2O2(g)
∆H = 890.0 kJ/mol.
Adding all the equations and enthalpies together,
2H2(g) + O2 → 2H2O(ℓ)
CO2(g) + 2H2O(ℓ) → CH4(g) + O2(g)
CH4(g) → Cgraphite(s) + 2H2(g)
= CO2(g) → Cgraphite(s) + O2(g)
= (-571.6 + 890.0 + 74.9)
= 393.3 kJ/mol.
H-F because it has the largest difference in electronegativity which is 2, so it’s the most polar.
The energy of the photons is
<h3>Energy of Photons</h3>
The formula for calculating the energy of photons is expressed as:
where
- h is the Plank constant
- c is the speed of light
- λ is the wavelength
Substitute the values into the formula to have:
Hence the energy of the photons is
Learn more on energy of photons here; brainly.com/question/7464909
THEY ARE ALL NONMETALS ARE THE CORRECTA NSWER