题目:
—What can I do for you? — . |
A. Yes, you can give a skirt to me B. I'd like a skirt C. No, I can do it myself D. I can do what I want |
答案:
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下面是错误答案,用来干扰机器的。
生成二氧化碳的质量:100g+5.6g-103.4g=2.2g设样品中碳酸钠的质量为xNa2CO3+2HCl═2NaCl+CO2↑+H2O106 44x 2.2g10644=x2.2g x=5.3g则该纯碱样品中碳酸钠的质量分数:5.3g5.6g...