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Massa=n.Mr
10=n.18
n= 0,55 mol
X=n.L
X= 0,55 . 6,.10^23
X= 3,3 . 10^23 molekul
B.
12=n. 46
n= 0,26 mol
X= 0,26. 6.10^23
X= 1,56 . 10^23 molekul
2a.
12.10^23 = n.6.10^22
n=2 mol
Massa= 2.24=48 gram
B.
9.10^23=n.6.10^23
n=1,5 mol
Massa= 1,5 . 160,5= 240,75 gram
3a.
12.10^23 = n . 6.10^23
n=2 mol
Volume gas, jika tidak diberitahu apa apa dianggap STP
Vstp= n . 22,4
Vstp= 2 . 22,4 = 44,8 L
B.
3.10^23= n . 6.10^23
n=0,5 mol
Vstp= 0,5 . 22,4 = 11,2 L
Jika membantu beri jawaban terbaik
a. 10 gram C₂H₆
mol = massa/Mr = 10/30 = 0,33 mol
JM = mol x Avogadro
JM = 0,33 x 6,02 x 10²³
JM = 2 x 10²³
b. 12 gram NO₂
mol = massa/Mr = 12/46 = 0,26 mol
JM = mol x Avogadro
JM = 0,26 x 6,02 x 10²³
JM = 1,57 x 10²³
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2.) Menghitung massa
a. 12 x 10²³ Mg
mol = JM/Avogadro
mol = 12 x 10²³/6,02 x 10²³ = 1,994 mol
massa = mol x Ar
massa = 1,994 x 24
massa = 47,84 gram
b. 9 x 10²³ Al₂Cl₃
mol = JM/Avogadro
mol = 9 x 10²³/6,02 x 10²³ = 1,495 mol
massa = mol x Mr
massa = 1,495 x 160,5
massa = 239,95 gram
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3. Menghitung Volume (pada STP)
a. 12 x 10²³ partikel H₂
mol = JM/Avogadro
mol = 12 x 10²³/6,02 x 10²³ = 1,99 mol
Volume = mol x STP
Volume = 1,99 x 22,4
Volume = 44,65 Liter
b. 3 x 10²³ partikel NO
mol = JM/Avogadro
mol = 3 x 10²³/6,02 x 10²³ = 0,498 mol
Volume = mol x STP
Volume = 0,498 x 22,4
Volume = 11,63 Liter