The protons come from water. Sulfur oxides dissolve in water to form sulfurous and sulfuric acids, and nitrogen oxides dissolve to form nitrous and nitric acids.
Answer:
A. 29.9
Explanation:
- An element can have differing numbers of neutrons in its nucleus, but it always has the same number of protons. The versions of an element with different neutrons have different masses and are called isotopes.
- The average atomic mass for an element is calculated by summing the masses of the element’s isotopes, each multiplied by its natural abundance on Earth.
<em>Average atomic mass of P = ∑(Isotope mass)(its abundance)</em>
∴ Average atomic mass of P = (P-29 mass)(its abundance) + (P-30 mass)(its abundance) + (P-31 mass)(its abundance) + (P-33 mass)(its abundance)
<em>Abundance of isotope = % of the isotope / 100.</em>
<em>∴ Average atomic mass of P =</em> (29)(0.327) + (30)(0.4803) + (31)(0.184) + (33)(0.0087) = <em>29.88 a.m.u ≅ 29.9 a.m.u.</em>
<em></em>
<em>So, the right choice is: A. 29.9</em>
How do the isotopes of a given element differ from one another? Since the isotopes of any given element all contain the same number of protons, they have the same atomic number. However, since the isotopes of a given element contain different numbers of neutrons<span>,different isotopes have different </span>mass<span> numbers</span>
The answer is C.
Since KOH and MgCl2 are in a 2:1 ratio, the moles of MgCl2 formed will always be half of the moles of KOH. The only answer where moles of KOH are halved is option C
<u>Answer:</u> The energy of the photon of light emitted is and energy emitted per mole of sodium atoms is
<u>Explanation:</u>
The relation between energy and wavelength of light is given by Planck's equation, which is:
where,
E = energy of the photon
h = Planck's constant =
c = speed of light =
= wavelength of photon = 330 nm = (Conversion factor: )
Putting values in above equation, we get:
To calculate the energy emitted per mole of sodium atom, we use the equation given by Planck's equation, which is:
where,
E = energy of the photon
= Avogadro's number =
h = Planck's constant =
c = speed of light =
= wavelength of photon = 330 nm =
Putting values in above equation, we get:
Hence, the energy of the photon of light emitted is and energy emitted per mole of sodium atoms is