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massa C = 75% x 100 = 75 gram
massa H = 25% x 100 = 25 gram
C : H = (75/12) : (25/1)
C : H = 1 : 4
Rumus empiris nya adalah CH4
semoga membantu :)
Mr senyawa
= 1 × 40 × 100 %
136
= 29,41176