Đáp án:
`m_{CH_4}=n_{CH_4}×M_{CH_4}=0,3×16=4,8(g)`
`M_{CH_4}= 12 + 4.1 = 16`
`->m_{CH_4}=n_{CH_4} × M_{CH_4} = 0,3 × 16 = 4,8 (g)`
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