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Perhatikan persamaan reaksi (belum setara) berikut. Jika 2,8 g CO bereaksi sempurna menghasilkan 14,4 g MO (Ar O=16;C=12), Ar M adalah ......

Perhatikan persamaan reaksi (belum setara) berikut.

M subscript 2 O subscript 3 left parenthesis s right parenthesis plus C O left parenthesis g right parenthesis rightwards arrow M O left parenthesis s right parenthesis plus C O subscript 2 left parenthesis g right parenthesis

Jika 2,8 g CO bereaksi sempurna menghasilkan 14,4 g MO (Ar O=16;C=12), Ar M adalah ......

  1. 14

  2. 27

  3. 56

  4. 74

  5. 148

Jawaban:

M o l space C O equals fraction numerator g r a m over denominator M r end fraction equals fraction numerator 2 comma 8 space g r a m over denominator 28 space g divided by m o l end fraction equals 0 comma 1 space m o l  P a d a space p e r s a m a a n space r e a k s i comma space m o l space a k a n space s e t a r a space d e n g a n space k o e f i s i e n space colon  M subscript 2 O subscript 3 plus C O rightwards arrow 2 M O plus C O subscript 2  space space space space space space space space space space space 0 comma 1 space m o l space space space 0 comma 2 space m o l  M r space M O equals fraction numerator g r a m over denominator m o l end fraction equals fraction numerator 14 comma 4 space g r a m over denominator 0 comma 2 space m o l end fraction equals 72 space g divided by m o l  A r space M plus A r space O equals 72  A r space M plus 16 equals 72  A r space M equals 56 space g divided by m o l

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