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Nilal begin mathsize 14px style increment Hρ space left parenthesis kJ space mol to the power of short dash 1 end exponent right parenthesis end style untuk begin mathsize 14px style Ba to the power of 2 plus end exponent left parenthesis aq right parenthesis end style = +540 dan begin mathsize 14px style SO subscript 4 to the power of 2 short dash end exponent end style(aq) = -910. Jika entalphi reaksi pengendapan begin mathsize 14px style BaSO subscript 4 end style(s) adalah -30 kJ, maka entalphi pembentukan standar begin mathsize 14px style BaSO subscript 4 end style(s) adalah .... begin mathsize 14px style open parentheses kJ space mol to the power of short dash 1 end exponent close parentheses end style

  1. -1480

  2. -400

  3. 0

  4. +400

  5. +1480

A. Tiara

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

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Pembahasan

begin mathsize 14px style Persamaan space reaksi space pengendapan space Ba S O subscript 4  Ba to the power of plus 2 end exponent space open parentheses aq close parentheses space plus space S O subscript 4 to the power of – 2 end exponent space rightwards arrow space Ba S O subscript 4 space open parentheses s close parentheses space space space space ΔH equals – 30 space kJ  Untuk space mendapatkan space perubahan space entalphi space pembentukan space  Ba S O subscript 4 comma space bisa space dilakukan space dengan space persamaan space penentuan space  eltalphi space reaksi space pengendapan space dengan space data space perubahan space  entalphi space pembentukan point    ΔH subscript pengendapan equals left square bracket jumlah space ΔH to the power of o f subscript produk right square bracket space – space left square bracket jumlah space ΔH to the power of o f subscript reaktan right square bracket  space space space space space space space space space space space space space space space space space space space space space equals left square bracket ΔH to the power of o f space Ba S O subscript 4 right square bracket space – space left square bracket left parenthesis ΔH to the power of o f space Ba to the power of plus 2 end exponent right parenthesis plus left parenthesis space ΔH to the power of o f space S O subscript 4 to the power of – 2 end exponent right parenthesis right square bracket  space space space space space space space space space space space space space – 30 space equals left square bracket ΔH to the power of o f space Ba S O subscript 4 right square bracket space – space left square bracket left parenthesis plus 540 right parenthesis plus left parenthesis – 910 right parenthesis right square bracket  space space space space space space space space space space space space space – 30 space equals left square bracket ΔH to the power of o f space Ba S O subscript 4 right square bracket space plus space 370  left square bracket ΔH to the power of o f space Ba S O subscript 4 right square bracket equals – 400 space kJ forward slash mol end style

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