鎂與鹽酸作用產生氫氣

STP時的氫氣28mL=> 28/22400 = 1/800 =0.00125mole

Mg + 2HCl → MgCl2 + H2
反應莫耳數比Mg : H2 =1 : 1
所以欲氫氣0.00125mole ，需要0.00125mole的鎂帶
0.00125mole的鎂帶=0.00125* 24.3 = 0.030375g
= 0.030375g*100cm/g =3.0375 cm

需要鎂帶 3.0375cm