有一铁粉和氧化铜的混合物6.96g，进行如下实验：
根据实验所得数据，关于混合物相关说法正确的是
| A．生成气体质量为0.2g | B．原混合物中铁的质量分数无法计算 |
| C．实验中反应的H2SO4质量为10.78g | D．原混合物中铜元素的质量不一定为0.64g |
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