Answer:
because in the different countries it is distributed unevenly.
Explanation:
hope this helps
Answer:
Explanation:
Volume of cylinder = πr²h where r is radius of cylinder, h is height of cylinder
r = d/2 = 21/2 = 10.5 cm; h = 25.2 cm
volume of cylinder = (22 * 10.5 cm * 10.5 cm * 25.2 cm) / 7
volume = 8731.8 cm³ = 8.7318 L
Using the ideal gas equation, PV = nRT
P = 4.00 MPa = 4.0 * 10³ kPa, V = 8.7318 L, R = 8.314 L.kPa/mol.K,
n = mass / molar mass
where mass = 0.474 kg or 474 g, molar mass of BF₃= 68 g/mol
n = 474 g / 68 g/mol = 6.9706 moles
making T subject of formula in the ideal gas equation;
T = PV/nR
T = (4.0 * 10³ kPa * 8.7318 L)/(6.9706 mol * 8.314 L.kPa/mol.K)
T = 602.675 K
T in °C = K - 273.15
T = 602.675 -273.15 = 329.5 °C
T = 330 °C
<h3>
Answer:</h3>
1.380 × 10^-8 M
<h3>
Explanation:</h3>
The pH is the measure of alkalinity or acidity of a substance.
It is the negative logarithm of H+ ions concentration [H+].
pH = -log[H+]
pOH on the other hand is negative logarith of OH- concentration [OH-].
pOH = -log[OH-]
In this case;
pOH = 7.86
We can calculate the [OH-]
pOH = -log[OH-]
But, pOH = 7.86
pOH = -log[OH-]
-log[OH-] = 7.86
[OH-] = Antilog -7.86
= 1.380 × 10^-8 M
Therefore, [OH-] is 1.380 × 10^-8 M