Answer:
[AB] is 0.65 M
Explanation:
Let the concentration of AB after 10.3s be y
Rate = ky^2 = change in concentration of AB/time
k = 0.2 L/mol.s.
Change in concentration of AB = 1.5 - y
Time = 10.3s
0.2y^2 = 1.5-y/10.3
0.2y^2 × 10.3 = 1.5 - y
2.06y^2 = 1.5 - y
2.06y^2 + y - 1.5 = 0
The value of y must be positive and is obtained using the quadratic formula
y = [-1 + sqrt(1^2 -4×2.06×-1.5)]/2(2.06) = [-1 + sqrt(13.36)]/4.12 = 2.66/4.12 = 0.65 M
2CaO + 2CO2 → 2CaCO2 + O2 is right
42.875cm³ ; 422.73 cm³
Given that:
Volume of a cube (V) = a³
a = 3.5cm
V of a cube = (3.5cm)^3
Volume of a cube = 3.5cm * 3.5cm * 3.5cm
Volume of a cube = 42.875cm³
Volume of a Sphere, V = 4πR²
V = 4 * π * 5.8²
V = 4 * π * 33.64
V = 422.73270
V = 422.73 cm³