下列说法正确的是（　　）①1mol氧气   ②0.5mol Al3+③0.2mol 氢原子  ④氨的摩尔质量是17g/mol⑤1mol水分子中含有10mol质子和10NA个电子⑥0.5mol 氦气在标准状况下体积约为11.2升．

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