Two 42.4-cm metal rods, one made of copper and one made of aluminum, are placed end to end, touching each other. One end is fixed, so that it cannot move. The rods are heated from 0.0C to 146.0C. How far does the other end of the system of rods move? Coefficients of linear expansion for aluminum is 23.0 106 K1 and for copper is 16.0 106 K1 . mm How many hydrogen atoms are present in 637.6 g of sucrose (C12H22O11)? (Molar mass of carbon = 12.011g/mol, molar mass of hydrogen = 1.008 g/mol, and molar mass of oxygen = 15.999 g/mol) 1025 atoms What is the total translational kinetic energy of the gas molecules of air at atmospheric pressure that occupies a volume of 4.70 L? J Please help me please