Answer:
0.11%
Explanation:
Without mincing words, let us dive straight into the solution to the question/problem. The first step to solve this question is to write out the chemical reaction, that is the reaction showing the dissociation of acetic acid.
CH3COOH <=======================================> CH3COO⁻ + H⁺
Initially, the amount present in the acetic acid which is = 12M, the concentration for CH3COO⁻ and H⁺ is 0 respectively.
At equilibrium, the amount present in the acetic acid which is = 12 - x, the concentration for CH3COO⁻ = x and H⁺ = x respectively. Note that the ka for acetic acid = 1.8 × 10⁻⁵.
1.8 × 10⁻⁵ = x²/ 14 - x. Therefore, x = 0.0158 M.
The next thing to do is to calculate for the percentage of dissociation, this can be done as given below:
percentage of dissociation = x/14 × 100. Recall that the value that we got for x = 0.0158 M. Hence, the percentage of dissociation = 0.0158 M/ 14m × 100 = 0.11%
Answer:
m H2O = 56 g
Explanation:
∴ The heat ceded (-) by the Aluminum part is equal to the heat received (+) by the water:
⇒ - (mCΔT)Al = (mCΔT)H2O
∴ m Al = 25.0 g
∴ Mw Al = 26.981 g/mol
⇒ n Al = (25.0g)×(mol/26.981gAl) = 0.927 mol Al
⇒ Q Al = - (0.927 mol)(24.03 J/mol°C)(26.8 - 86.4)°C
⇒ Q Al = 1327.64 J
∴ mH2O = Q Al / ( C×ΔT) = 1327.64 J / (4.18 J/g.°C)(26.8 - 21.1)°C
⇒ mH2O = 55.722 g ≅ 56 g
The milk of magnesia is a
suspension of magnesium hydroxide in water, which is a strong base that is used
to neutralize excess stomach acid. The presence of stomach acid or hydrochloric
acid (HCl) that is known to be a strong acid will react with the strong base and
neutralization reaction occurs since conjugate partners produced negligible
strength where the products are a salt and water.
Steam is water (H2O)
The relative molecular mass of water has to be calculated:
Refer to periodic table for molar mass/relative atomic mass for every element
Hydrogen has molar mass of 1g but as it is H2 there are 2 moles so : 2*1g =2g
Oxygen has molar mass of 16g
So relative molecular mass of water equals 18g
To find the number of moles of water in 9g divide mass (9g) by relative molecular mass of water (18g) u get 0.5 moles .
1 mole = 6.03*10^23 particles (in this case molecules)Avogadro's number
So 0.5 *(6.03*10^23)= 3.015*10^23 molecules
9 gram of steam contain 3.015*10^23 H2O molecules.
Note: 9 gram of water whether as ice or liquid water or steam always contains 3.015*10^23 water molecules.
9 grams of ice or liquid water or steam have different volumes but same number of molecules . Probably u need a lot balloons filled with water vapour to get 9 grams whereas u need a small cube of ice to get these 9 grams .Ice is more dense than water vapour.