Kimia

Pertanyaan

1.menentuka mol dari:
a.40 gram CaCO3 (ArCa=40,C=12,O=16)
b. 3,6 gram air (ArH=1, O=16)

2. Tentukan massa hari:
a. 3 mol gas N2(ArN=14)
b. 0,4 mol CH4 (Ar C =12,H=1)
c. 0,8 mol NH3

#Tolong bantu jawab hari ini di kumpul
1.menentuka mol dari: a.40 gram CaCO3 (ArCa=40,C=12,O=16) b. 3,6 gram air (ArH=1, O=16) 2. Tentukan massa hari: a. 3 mol gas N2(ArN=14) b. 0,4 mol CH4 (Ar C =12

1 Jawaban

  • a.40 gram CaCO3 (ArCa=40,C=12,O=16)
    n = m/Mr Mr CaCO3=(40+12+3(16))=100 g/mol
    n = 40/100=0.4 mol
    b. 3,6 gram air (ArH=1, O=16)
    Mr H2O = 16+1(2) = 18 g/mol
    n = 3,6/18 = 0.2 mol
    a. 3 mol gas N2(ArN=14)
    m = n . Mr = 3 . 2(14) = 84 g
    b. 0,4 mol CH4 (Ar C =12,H=1)
    m = 0,4 . (12+4(1)) = 6.4 g
    c. 0,8 mol NH3
    m = 0.8 . (14+3(1)) = 13.6 g