2. Describe how you would prepare 30 g of a 20 percent ( \( \mathrm{w} / \mathrm{w}) \) solution of KCl in water. Given: \( 30 \mathrm{~g}= \) mass of solution, \( 20 \%(\mathrm{w} / \mathrm{w}) \) Required: mass of KCL and mass of water

53. Draw the transfer diagram for when Calcium bonds to chlorine.

Sample Problem: A 40 g of Sodium Hydroxide \( (\mathrm{NAOH}) \) is dissolved in enough water to give 110 grams of solution. Calculate the percentage by mass of the solution.

8. สารละลายเปอร์คลอริก \( \left(\mathrm{HClO}_{4}\right) \) เขัมขัน 0.2 โมลต่อลิตร ปริมาตร \( 100^{0.1 \mathrm{~L} \text { มิลลิลิตร มี }} \) ไอออนใดบ้าง อย่างละกีโโมล \[ \mathrm{HCl} \]

Which of the following processes is most sultable for extracting sodium chloride from sea water? A. electrolysis O. erystallisation C. stmple distillation D. fractional distillation

3. a) How many joules are needed to melt 1 gram of \( 0^{\circ} \mathrm{C} \) ice and turn it to water at a room temperature of \( 23^{\circ} \mathrm{C} \) ? b) How many calories are needed to melt \( 1 \mathrm{gram} \mathrm{O}_{\mathrm{f}} 0^{\circ} \mathrm{C} \) ice and turn it to water at a room temperature of \( 23^{\circ} \mathrm{C} ? \quad 1 \)