Answer: There are 20 grams
Explanation:
Thomas discovered cathode rays when he was working with electrons. He was performing experiments with electrons when one of them became electrically charged and a beam of light came from it, this creating a cathode ray.
Answer
is: concentration
ammonia is higher than concentration of ammonium ion.<span>
Chemical reaction of ammonia in water: NH</span>₃ + H₂O →
NH₄⁺ + OH⁻.<span>
Kb(NH</span>₃) = 1,8·10⁻⁵.<span>
c</span>₀(NH₃) = 0,8 mol/L.<span>
c(NH</span>₄⁺) =
c(OH⁻) = x.<span>
c(NH</span>₃) =
0,8 mol/L - x.<span>
Kb = c(NH</span>₄⁺) · c(OH⁻) /
c(NH₃).<span>
0,000018 = x² / 0,8 mol/L - x. </span>
<span>x</span>² + 0,000018x - 0,0000144 = 0.
<span>
solve quadratic equation: x = c(NH</span>₄⁺) = 3,79·10⁻<span>³ mol/L.</span>
The rate constant is 4.84 * 10^11 s-1.
From the Arrhenius equation;
k = Ae^-Ea/RT
k = rate constant = ?
A = frequency factor = 4.99×1011 s−1
Ea = Activation energy = 86.4 kJ/mol
R = gas constant = 8.314 J/K/mol
T = Absolute temperature = 74.0 °C + 273 = 347 K
k = 4.99×10^11e^- 86.4/8.314 * 347
k = 4.84 * 10^11 s-1.
The rate constant is 4.84 * 10^11 s-1.
Learn more: brainly.com/question/626780