"copper is a red-brown element obtained from copper sulfide ores by heating the ores in air, which forms copper oxide. heating the copper oxide with carbon produces impure copper, which is purified by electrolysis." how many of these, i) color ii) heating with carbon iii) purification by electrolysis

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm