（6分）取22.1g碳酸钠和碳酸氢钠的混合粉末样品，将其分成两等份，取其中一份加热到质量不再改变，冷却后称其质量为7.95g；另一份溶于水，配成600mL溶液。试计算（计算结果用小数形式表示）：

（1）原样品中碳酸钠的物质的量为多少？

（2）所配溶液中Na⁺的物质的量浓度为多少？

用所给词或词组的适当形式填空

1. If I _________(be)you,I would not do such a thing.

2. If he_________( follow) the doctor's advice, he would not have died.

3.If I___________( know) her well, I would tell you about her.

4. If she_________(be)more careful,she wouldn't have made these mistakes.

5. If he________(go over )his lessons yesterday,he would pass the exam now.