欲配制100ml 1.0 mol/L Na 2 SO 4 溶液,正确的方法是 [ ] ① 将14.2 g Na 2 SO 4 溶于100mL水中 ② 将32.2g Na 2 SO 4 ·10H 2 O溶于少量水中,再用水稀释至100mL ③ 将20 mL 5.0 mol/L Na 2 SO 4 溶液用水稀释至100 mL
【简答题】If an object weighed one pound 8 000 miles above the earth, it would weighon the suce of the earth. [A] 6 pounds [B] 4 pounds [C] 9 pounds [D] 1/9 pound