Answer:
817.66 g/mol
Explanation:
The <em>freezing point change</em> can be calculated by the formula:
Where m is the molality of the solute in NO, Kf is the cryoscopic constant (in K·kg/mol), and i is 1 in this case (because the substance in non-dissociating).
We can <u>calculate Kf of NO</u> with the information given by the problem and the formula:
Where R is the universal gas constant (8.314 J·mol⁻¹·K⁻¹), M is the molar mass of NO (30 g/mol, or 0.03 kg/mol), T f is the freezing point of NO (in K), and ΔH is the heat of fusion.
- Kf = 8.314 J·mol⁻¹·K⁻¹ * 0.03 kg/mol * (109.16 K)² ÷ 2300 J/mol = 1.292 K·kg/mol
Now we calculate the molality of the solute in NO:
<em>Molality is equal to the moles of solute per kilogram of solvent</em>:
- 0.1370 m = moles solute/ 1 kg NO
- moles solute = 0.1370 moles
With the given mass of the solute we <u>can calculate the molar mass</u>:
- 112 g / 0.1370 moles = 817.66 g/mol
NaOH but you didnt give options
Answer:
Number of hydrogen sulfide molecule = 5.7672 x 10²³ (Approx)
Explanation:
Molar mass of H2S = (1x2) + 32 = 34 g
Total number of molecule = 34 / 35.50
Total number of molecule = 0.9577
Avogadro's number = 6.022 x 10²³
Number of hydrogen sulfide molecule = 0.9577 x 6.022 x 10²³
Number of hydrogen sulfide molecule = 5.7672 x 10²³ (Approx)
Evaporation: process of a liquid changing to a gas.
precipitation: rain, snow, sleet, or hail that falls to the ground.
condensation: process of changing a gas to liquid.
Cd + 2HCl → CdCl₂ + H₂, 2ZnS + 3O₂ → 2ZnO + 2SO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O reactions are redox reaction.
<h3>What is redox reaction?</h3>
Redox reactions are those reactions in which oxidation and reduction process takes place simultaneously.
Above balanced equation is a redox reaction as in this reaction oxidation of Cadmium takes place from 0 to+2 state and reduction of hydrogen takes place from +1 to 0 state.
- CuCl₂ + Na₂S → 2NaCl + CuS
- CaCO₃ → CaO + CO₂
Above two balanced reaction are not the redox reaction as their is no oxidation or reduction takes place.
Above balanced equation is a redox reaction as in this reaction oxidation of sulfur takes place from -2 to+4 state and reduction of oxygen takes place from 0 to -2 state.
Above balanced equation is a redox reaction as in this reaction oxidation of carbon takes place from -4 to+4 state and reduction of oxygen takes place from 0 to -2 state.
Hence, Cd + 2HCl → CdCl₂ + H₂, 2ZnS + 3O₂ → 2ZnO + 2SO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O reactions are redox reaction
To know more about redox reaction, visit the below link:
brainly.com/question/26263317