Dr. Goldberg, a noted dietician, mixes different solutions as part of her research into sugar substitues. By weight, she mixes 40% of a sample of substitute A and 70% of a sample of substitute B to create substitute C. IF Dr. Goldberg initially had 60 grams of substitute A and 110 grams of substitute B, then what would be the weight , in grams, of substitue C?

A student , determined the solubility of four substabces ,potassium nitrate ,sodium , sodim choride ,potassium choride and ammonium choride in a water at five different temperatures of 10^(@)C, 20^(@(C 40^(@)C,60^(@) C and 80^(@)C and obtained the following data : (a) what mass of potassium nitrate woulds be needed to make a satured solution of potassium nitrate in 50 grams of water at 40^(@)C ? (b) what would be observed if a saturated solution of potassium choride at 80^(@)C is left to cool to the room temperature ? ( c) what is the solubilty of each salt at 20^(@) C ? which salt has the highest solubility at this temperature ? (d) what is the effect of change of temperature on the solbubility of a salt as shown by the above date?