Complete the following statement: The atomic mass unit (u) is defined so that 1 u is exactly equal to the mass of 1/12 of a carbon-12 atom. 1/4 of a helium molecule. 1/16 of an oxygen-16 atom. 1/32 of an oxygen molecule. a single hydrogen atom.
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Complete the following statement: The atomic mass unit (u) is defined so that 1 u is exactly equal to the mass of A) a single hydrogen atom B) 1/4 of a helium molecule: C) 1/12 of a carbon-12 atom D) 1/16 of a oxygen-16 atom: E) 1/32 of an oxygen molecule:
Ryan M.
A Although carbon-12 is now used as the standard for atomic masses, this has not always been the case. Farly attempts at classification used hydrogen as the standard, with the mass of hydrogen being set equal to 1.0000 u. Later attempts defined atomic masses using oxygen (with a mass of $16.0000 \mathrm{u}$ ). In each instance, the atomic masses of the other elements were defined relative to these masses. (To answer this question, you need more precise data on current atomic masses: $\mathrm{H}, 1.00794 \mathrm{u} ; \mathrm{O}$ $15.9994 \mathrm{u} .)$ (a) If $\mathrm{H}=1.0000 \mathrm{u}$ was used as a standard for atomic masses, what would the atomic mass of oxygen be? What would be the value of Avogadro's number under these circumstances? (b) Assuming the standard is $\mathrm{O}=16.0000 \mathrm{u}$, determine the value for the atomic mass of hydrogen and the value of Avogadro's number.
Helium atoms have a mass of 4u and oxygen molecules have a mass of 32u, where u is defined as an atomic mass unit (u = 1.660540 x 10^(-27) kg). Compare a gas of helium atoms to a gas of oxygen molecules.
Aparna S.
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