2. Two 54.1-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 148.0C. 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

3. How many hydrogen atoms are present in 722.6 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