4. How many Hydrogen atoms are present in one mole of H₂? (A) 6.022 × 10⁻²³ g (B) 6.022 × 10²³ g (C) 1.204 × 10²⁴ g (D) 3.011 × 10²³ g

9. Equilibrium is reached in chemical reactions when: (A) The rates of the forward and reverse reactions become equal. (B) The concentrations of reactants and products become equal. (C) The temperature shows a sharp rise (D) All chemical reactions stop. (E) The forward reaction stops.