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Snowcat [4.5K]
3 years ago
8

Is the mass of the reactants always equal to the mass of the products in a chemical reaction?

Chemistry
1 answer:
Sunny_sXe [5.5K]3 years ago
5 0

Answer: Yes, the mass of the reactants always equal to the mass of the products in a chemical reaction.

Explanation:

In a balanced chemical reaction, the mass of reactants is always equal to the mass of product that is a chemical reaction follows follows 'Law of Conservation of Mass'.

The law states that ' in a chemical reaction mass can neither be created nor be destroyed.

For example: 2H_2+O_2\rightarrow 2H_2O

Mass of the reactants = Mass of products

2(2\times 1amu)+1(2\times 16amu)=2(2\times 1amu+16amu)

36 amu = 36 amu

Yes, the mass of the reactants always equal to the mass of the products in a chemical reaction.

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The correct answer is B.

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4 years ago
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A monoprotic weak acid when dissolved in water is 0.66% dissociated and produces a solution with a pH of 3.04. Calculate the Ka
raketka [301]

Answer:

Ka = 6.02x10⁻⁶

Explanation:

The equilibrium that takes place is:

  • HA ⇄ H⁺ + A⁻
  • Ka = [H⁺][A⁻]/[HA]

We <u>calculate [H⁺] from the pH</u>:

  • pH = -log[H⁺]
  • [H⁺] = 10^{-pH}
  • [H⁺] = 9.12x10⁻⁴ M

Keep in mind that [H⁺]=[A⁻].

As for [HA], we know the acid is 0.66% dissociated, in other words:

  • [HA] * 0.66/100 = [H⁺]

We <u>calculate [HA]</u>:

  • [HA] = 0.138 M

Finally we <u>calculate the Ka</u>:

  • Ka = \frac{[9.12x10^{-4}]*[9.12x10^{-4}]}{[0.138]} = 6.02x10⁻⁶
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3 years ago
Needed Help...<br> for this work​
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How do you expect the size of the atoms to change as you go from neon to argon to krypton
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The number of energy levels will increase.

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[15 Points, Stoichiometry and Gases]
KiRa [710]

The reaction is

CaC₂(s) + 2H₂O (l) -----> Ca(OH)₂ (s) + C₂H₂ (g) ​

As we have data of gas ethyne (or acetylene), C₂H₂

We can calculate the moles of acetylene and from this we can estimate the mass of calcium carbide taken

the moles of acetylene will be calculated using ideal gas equation

PV =nRT

R = gas constant = 0.0821 Latm/molK

T = 385 K

V = volume = 550 L

P = Pressure = 1.25 atm

n = moles = ?

n = PV /RT = 1.25 X 550 / 0.0821 X 385 = 21.75 mol

As per balanced equation these moles of acetylene will be obtained from same moles of calcium carbide

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