Science

Please help me
PCl5 + H2O → H3PO4 + HCl

What coefficients will balance the equation?

1, 4, 1, 5
1, 5, 1, 1
2, 5, 1, 2
2, 4, 2, 5

And

NH4OH(aq) → H2O(l) + NH3(g)

What coefficients will balance the equation?

1, 2, 2
3, 3, 4
2, 1, 2
1, 1, 1

I think the second question is 212 but not sure I really need help

  1. 👍
  2. 👎
  3. 👁
  1. I'm not a chemist by profession so I found this on the Internet.

    I think these are the solutions, at least the best that can be found on the Internet.

    The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction. The number of atoms in the reactants has to balance the number of atoms in the products.

    Compare the number of atoms for each element on both sides of the equation, change the coefficient so the number is the same.

    PCl₅ + H₂O→H₃PO₄ + HCl

    ​P is balanced becouse you have 1 P atom on left side and 1 P atom on right side.

    To​ balance Cl multiply HCl by 5.

    PCl₅ + H₂O→H₃PO₄ + 5 HCl

    Cl is balanced becouse you have 5 Cl atom on left side and 5 Cl atom on right side.

    To balance H multiply H₂O by 4.

    PCl₅ + 4 H₂O→H₃PO₄ + 5 HCl

    H is balanced becouse you have 4 H atom on left side and 3 + 1 = 4 H atom on right side.

    O is balanced becouse you have 4 O atom on left side and 4 O atom on right side.

    So:

    PCl₅ + 4 H₅O→H₃PO₄ + 5 HCl

    Solution:

    1 , 4 , 1 , 5

    Balance reaction algebraicly:

    Add unknown coefficients to all molecules.

    u PCl₅ + v H₂O→ w H₃PO₄ + t HCl

    Create system of equations to find the coefficients.

    To balance P:

    u = w

    To balance Cl:

    5u = t

    To balance H:

    2 v = 3 w + t

    To balance O:

    v = 4 w

    Now you have system of equations:

    u = w

    5 u = t

    2 v = 3 w + t

    v = 4 w

    The solutions are:

    t = 5 , v = 4 , w = 1, u = 1

    1 ∙ PCl₅ + 4 ∙ H₂O→ 1 ∙ H₃PO₄ + 5 ∙ HCl

    Solution:

    1 , 4 , 1 , 5

    Similarly:

    NH₄OH→ H₂O + NH₃

    Solution:

    1 , 1 , 1

    ​Balance reaction algebraicly:

    Add unknown coefficients to all molecules.

    u NH₄OH→ v H₂O + w NH₃

    Create system of equations to find the coefficients

    To balance N:

    u = w

    To balance H:

    5u = 2 v + 3 w

    To balance O:

    u = v

    Now you have system of equations:

    u = w

    5 u = 2v + 3 w

    u = v

    The solutions are:

    v = 1 , w = 1, u = 1

    1 ∙ NH₄OH→ 1 ∙ H₂O + 1 ∙ NH₃

    Solution:

    1 , 1 , 1

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    PCl5 + H2O → H3PO4 + HCl What coefficients will balance the equation? 1, 4, 1, 5 1, 5, 1, 1 2, 5, 1, 2 2, 4, 2, 5 is it 1425

  2. chem

    NH4OH(aq) → H2O(l) + NH3(g) What coefficients will balance the equation? 1, 2, 2 3, 3, 4 2, 1, 2 1, 1, 1 is it 212

  3. Chemistry

    Balance the following chemical equation using the oxidation number method: K2Cr2O7 + SnCl2 + HCl → CrCl3 + SnCl4 + H2O + KCl

  4. Chemistry

    Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction:H3PO4 + Mg(OH)2 -----> Mg3(PO4)2 + H2O.Balance the equation, then enter the coefficients

  1. chemistry HWK MAKES NO SENSE

    balance: H3PO4 + Mg(OH)2 → Mg3(PO4)2 + H2O

  2. Science

    What equation correctly represents the reaction of lithium hydroxide (LiOH) with hydrogen chloride (HCl)? LiOH + HCl → LiCl + H2O LiOH + H2O → LiCl + HCl LiCl + HCl → LiOH + H2O LiCl + H2O → LiOH + HCl

  3. chemistry

    how would you begin this question? An empty 15.0 L cylinder, .500 moles of gaseous PCl5 are added and allowed to reach equilibrium. The concentration of PCl3 is found to be .0220M. (Temp at 375K) PCl3(g) + Cl2(g) --> PCl5(g) i

  4. Chemistry

    H3PO4 + 3KOH = K3PO4 + 3 H2O What would be the percent yield if you reacted 49.0g of H3PO4 with 112g of potassium hydroxide, and collected 25.0g of water?

  1. chemistry

    Phosphorus pentachloride, PCl5, reacts with water to form phosphoric acid, H3PO4, and hydrochloric acid, HCl. PCl5(s) + 4H2O() → H3PO4(aq) + 5HCl(aq) (a) What mass of PCl5 is needed to react with an excess quantity of H2O to

  2. Chemistry

    When the equation below is balanced and all coefficients are in the lowest, whole number ratio, the coefficients are: C2H6 + O2 ¨ CO2 + H2O I am currently doing an online worksheet to improve in chemistry and I am not quite

  3. chemistry

    the question reads: a) balance the equation: H3PO4 + Ca(OH)2 --> Ca3(PO4)2 + H2O b)what mass of each product results if 750 mL of 6.00 M H3PO4 reacts according to the equation? i balanced it with: 2H3PO4 + 3Ca(OH)2 --> Ca3(PO4)2 +

  4. Chemistry

    1. Calcium carbonate reacts with HCl according to the following equation: 2HCl(aq)+CaCO3(s)→CaCl2(aq)+H2O(l)+CO2(g) How many moles of HCl are in 65 mL of 0.15 M HCl? 2. What mass of calcium carbonate is needed for complete

You can view more similar questions or ask a new question.