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Consider a helium (H e) atom that absorbs a photon of wavelength 330 nm. The change in the velocity. (in cm s–1 of H e atom after the photon absorption is. Use: Planck constant = 6.6×10–34 J s, Avogadro number =6 ×1023 mol–1, Molar mass of H e= 4 g mol–1) . View Solution.
Atomic masses of 14 7 N and 16 8 O are 14.008 amu and 16.000 amu respectively. The mass of 1 1H atom is 1.007825 amu and the mass of neutron is 1.008665 amu. Pick the correct option. The atomic mass of 8O16 is 15.9949amu. Mass of one neutron and one proton is 2.016490amu and the mass of an electron is 0.00055amu.
The mass number of an atom is usually equal to the number of in the atom. The mass of Helium-4 atom is 6.64648 x 10^-24 g and each of its two electrons has a mass of 9.10939 x 10^-28 g. What fraction of the atom's mass is contributed by its nucleus? Calculate the mass defect of the helium nucleus 52He.
Number of atoms present in 52 g of helium is:( N A is Avogadro’s constant, Gram atomic mass of helium is 4 g ) . View Solution. Q 3.
Verified by Toppr. A helium atom has no charge, which means it has an oxidation number of 0. Neutrons have no charge. Since the numbers of protons and electrons are equal, the positive charge of the protons and the negative charge of the electrons add up to zero. 2 p + + 2 e − = 0. Therefore, a helium atom with two electrons, two protons, and ...
De Broglie wavelength for an average helium atom in a furnace at 400 K is k × 10 − 10 m. Find the value of k. Find the value of k. Here, Given the mass of helium = 4.002 a m u
The atomic mass and atomic number of a helium atom. Mass Number. Mass number is the sum of the number of protons and neutrons in the nucleus of an atom. So, if an atom of carbon has 6 protons and ...
An atom of an element contains 13 electrons. Its nucleus has 14 neutrons. Find out its atomic number and approximate atomic mass.
At what temperature would the average speed of helium atoms equal (a) the escape speed from the Earth, $$1.12 \times 10^4 m/s$$, and (b) the escape speed from the Moon, $$2.37 \times 10^3 m/s?$$ Note: The mass of a helium atom is $$6.64 \times 10^{-27} kg$$.
Avogadro's constant says that 1 mole of any atom contains Na atoms. In this case you have 2 atoms. moles of helium is = 2 N a The atomic mass of helium (He) will give you the weight of one mole of this molecule: 1 mol = 4.00 g