Stoikiometri

00:05:45
https://www.youtube.com/watch?v=TU2HplKBejo

概要

TLDRThis video explains stoichiometry, focusing on its role in quantifying substances in chemical reactions. Key principles include using moles, with conversions between mass, volume, and the number of particles using formulas derived from molar relationships. An example is provided on how to calculate the required mass of potassium permanganate for a specific molarity solution, demonstrating practical applications of stoichiometry in laboratory settings. The video encourages viewers to engage and look forward to future lessons on the laws of stoichiometry.

収穫

  • 🔍 Stoichiometry is essential for quantifying substances in reactions.
  • 📏 Units include mass, volume, particle counts, and more.
  • ⚖️ Moles are the foundation for calculations in stoichiometry.
  • 🔢 Avogadro's number helps convert moles to particles.
  • 📉 To find mass, multiply moles by relative molecular mass.
  • 💧 Molarity is calculated by dividing moles by solution volume.
  • 🔬 Example: Calculate mass needed for 500 mL of 1M potassium permanganate.
  • ✍️ The relative molecular mass (Mr) for KMnO4 is 158 g/mol.
  • 🎉 You need 79 grams of KMnO4 for the solution.
  • 🔮 Future videos will discuss fundamental stoichiometry laws.

タイムライン

  • 00:00:00 - 00:05:45

    The video introduces stoichiometry, a science used for calculating the quantities of substances using principles based on the concept of moles. It highlights various units such as weight, volume, and particle count. Key calculations include deriving moles from these units using specific relationships, such as dividing mass by molar mass, or using Avogadro's number for particle count. The video also discusses process exceptions when working with concentrations, providing examples of calculating the amount of potassium permanganate (KMnO4) needed to prepare a 1M solution in 500ml, detailing the steps to determine molarity and weight. It concludes with a brief mention of the next video on the fundamentals of stoichiometry.

マインドマップ

ビデオQ&A

  • What is stoichiometry?

    Stoichiometry is the science used to calculate the quantities of substances involved in a chemical reaction.

  • What units are used in stoichiometry?

    Units can include mass, volume, concentrations, and the number of particles.

  • What is a mole?

    A mole is a unit that measures the amount of a substance, based on the number of particles.

  • How do you convert moles to mass?

    Multiply the number of moles by the relative molecular mass (Mr).

  • What is Avogadro's number?

    Avogadro's number is approximately 6.02 x 10^23, it represents the number of particles in one mole.

  • How do you calculate molarity?

    Molarity is calculated by dividing the number of moles by the volume of the solution in liters.

  • What is the example provided in the video?

    The example involves calculating the mass of potassium permanganate needed to create a 500 mL solution at a concentration of 1 mol/L.

  • What is the Mr of potassium permanganate?

    The relative molecular mass of potassium permanganate (KMnO4) is 158 g/mol.

  • How much potassium permanganate is needed for the solution?

    79 grams of potassium permanganate is needed for the 500 mL of 1 mol/L solution.

  • What is the next topic of the video series?

    The next topic will cover the fundamental laws of stoichiometry.

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  • 00:00:00
    Hai
  • 00:00:02
    Hello sobat Let's di video kali ini kita
  • 00:00:06
    bahas tentang stoikiometri
  • 00:00:08
    Apa itu stokiometri
  • 00:00:12
    [Musik]
  • 00:00:17
    suatu ilmu yang digunakan dalam
  • 00:00:19
    menghitung kuantitas dari suatu zat
  • 00:00:23
    unit yang digunakan dalam konstitusi
  • 00:00:26
    bisa bermacam-macam seperti
  • 00:00:29
    bobot
  • 00:00:31
    volume
  • 00:00:33
    kadar jumlah partikel dan lain-lain
  • 00:00:38
    inti dari stokiometri menggunakan
  • 00:00:42
    prinsip moral
  • 00:00:44
    artinya semua perhitungan didasarkan
  • 00:00:48
    pada konsep mol
  • 00:00:57
    mencari suatu Mal dari beberapa ini
  • 00:01:00
    misalkan bobot volume jumlah partikel
  • 00:01:04
    maka dibagi dengan unit spesifiknya
  • 00:01:12
    [Musik]
  • 00:01:13
    volume tiba di dengan 22 liter per mol
  • 00:01:17
    dalam keadaan STP
  • 00:01:19
    bobot dibagi dengan massa atom relatif
  • 00:01:23
    atau disebut Mr jumlah partikel dibagi
  • 00:01:28
    dengan 6,02 kali 10 pangkat 23 atau
  • 00:01:32
    dikenal dengan bilangan avogadro
  • 00:01:37
    Sebaliknya apabila kita ingin mencari
  • 00:01:41
    unit seperti bobot jumlah partikel dan
  • 00:01:44
    volume dari Mal maka
  • 00:01:47
    mencari volume Mal dikalikan dengan 22
  • 00:01:51
    liter per mol dalam kalian STP mencari
  • 00:01:54
    bobot moldy kalikan dengan massa atom
  • 00:01:57
    relatif mencari jumlah Cut Mal dikalikan
  • 00:02:01
    dengan
  • 00:02:02
    6,02 kali 10 pangkat
  • 00:02:06
    [Musik]
  • 00:02:08
    23na Mun ada pengecualian mencari suatu
  • 00:02:12
    Mal dari kadar misal dalam bentuk
  • 00:02:15
    Melarikan maka dikalikan dengan unit
  • 00:02:19
    spesifiknya dan sebaliknya
  • 00:02:23
    molaritas dikalikan dengan volume dan
  • 00:02:26
    untuk mencari molaritas maka Mal dibagi
  • 00:02:29
    dengan volume
  • 00:02:32
    Contoh Soal
  • 00:02:35
    [Musik]
  • 00:02:36
    seorang analis ingin membuat larutan 500
  • 00:02:41
    ml kalium permanganat atau kmo4 1m
  • 00:02:46
    berapa gram kalium permanganat atau
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    kmno4 yang harus ditimbang
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    mula-mula mencari Mal kalium permanganat
  • 00:02:56
    satu molaritas = 1 mol per liter Hai 500
  • 00:03:01
    ml
  • 00:03:02
    dikonversi kedalam l menjadi
  • 00:03:06
    0,5 l
  • 00:03:08
    Mal kalium permanganat = 1 mol per liter
  • 00:03:13
    digali dengan 0,5 liter maka tidak
  • 00:03:18
    patkan 0,5 mol
  • 00:03:21
    kemudian menghitung bobot kalium
  • 00:03:24
    permanganat atau kmno4 yang ditimbang
  • 00:03:28
    diketahui air kalium 39 HR mangan 55 dan
  • 00:03:35
    Arok sigen 16
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    selanjutnya kita hitung Mr kalium
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    permanganat terlebih dahulu
  • 00:03:45
    Mr kalium permanganat = Ar kalium
  • 00:03:50
    ditambah er mangan ditambah empat dikali
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    am oksigen didapatkan
  • 00:04:00
    dan ditambah 55 ditambah
  • 00:04:04
    4315 =
  • 00:04:08
    158 maka Mr kalium permanganat
  • 00:04:13
    158 gram per mol setelah sebelumnya kita
  • 00:04:17
    mendapatkan Mr kalium permanganat
  • 00:04:20
    kemudian kita hitung bobot kalium
  • 00:04:24
    permanganat yang harus ditimbang Mal
  • 00:04:27
    kalium permanganat dikali dengan MR
  • 00:04:31
    kalium permanganat = 0,5 mol dikalikan
  • 00:04:35
    dengan
  • 00:04:36
    158 gram per mol
  • 00:04:39
    sama dengan 79 G
  • 00:04:43
    maka untuk membuat larutan 500 mili
  • 00:04:47
    kalium permanganat dengan konsentrasi 1m
  • 00:04:51
    ketimbang sebesar 79
  • 00:04:58
    [Musik]
  • 00:05:00
    hai
  • 00:05:03
    [Musik]
  • 00:05:22
    oke Cukup sekian penjelasan singkat
  • 00:05:25
    stoikiometri Thanks for watching video
  • 00:05:28
    selanjutnya tentang hukum dasar
  • 00:05:30
    stoikiometri stay tune trus ya jangan
  • 00:05:34
    lupa like comment dan subscribe nya
  • 00:05:36
    sobat Let's biar kami makin semangat
  • 00:05:39
    bikin video pembelajaran lainnya see you
タグ
  • stoichiometry
  • moles
  • mass
  • volume
  • Avogadro's number
  • molarity
  • potassium permanganate
  • chemistry
  • calculations
  • relative molecular mass