7) The tritium nucleus (H) consists of one proton and two neutrons. The mass ofa

Question

7) The tritium nucleus (H) consists of one proton and two neutrons. The mass ofa 7) tritium nucleus is: A. equal to the mass of the proton plus the mass of the two neutrons. B. equal to the mass of the proton only. C. more than the mass of the proton plus the mass of the two neutrons. D. less than the mass of the proton plus the mass of the two neutrons 8) What criterion must be met for a reversible reaction to be spontaneous? A. The equilibrium ccnstant must have a negative value. B. The equilibrium constant must be between 0 and 1 C. The equilibrium constant must be greater than 1. D. The equilibrium constant has nothing to do with spontaneity. 9) The decay constant ofcarbon-14 is 1.21 x 10-years·Out of a sample containing 1.00x10 atoms of carbon-14, about how many remain after 10,000 years? A. 298,000 B. 121,000 C. 702,000 D. 250,000 10) Which of the following processes results in a positive change in entropy of the system? A. the autoionization of water B, the dissociation of a weak acid in water , the melting of ice . the formation of FeS from sulfur and iron.

Explanation / Answer

Ans 7; A) equal to the mass of proton plus the mass of two neutrons

The atomic mass of an atom is the sum of the masses of protons and neutrons present in its nucleus. Thugh electrons are also present in the atom , but they have neglible mass , that is why it is often not considered in atomic mass.

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