Asample of an unknown substance has a mass of 89.5 g. if 345.2 j of heat are required to heat the substance from 285 k to 305 k, what is the specific heat of the substance?

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Asolution contains 180 g of glucose (c6h12o6) and 162 g of water. what is the mole fraction of glucose?

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