Berapa gram natrium akan menghasilkan 4.80 gram gas hidrogen dalam 2 "Na" +2 "H" _2 "O" -> 2 "NaOH" + "H" _2?

Jawapan:

# ~ 110g #

Penjelasan:

Pertama, kita memerlukan jumlah tahi lalat gas hidrogen.

#n ("H" _2) = (m ("H" _2)) / (M_r ("H" _2)) = 4.80 / 2 = 2.40mol #

Nisbah mol # "H" _2: "Na" # = #1:2#

Jadi, #4.80# tahi lalat # "Na" # diperlukan.

#m ("Na") = n ("Na") M_r ("Na") = 4.80 * 23 = 110.4g # daripada # "Na" #