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hurtadocrv
28.09.2019 •
Chemistry
Particles of clay and silt eroded and deposited by the wind are called?
a) till
b)loess
c) dust
d)sod
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Ответ:
B) loess
Explanation:
Loess is the correct option because of the fact that it is formed by the sediments which includes wind blowing silt of typically 20-50 micrometer size, and clay. The silt and clay are cemented with each other by calcium carbonate. The two chief ingredients are in equal proportions.
Ответ:
Option A = 1 L
Explanation:
Given data:
Volume of CH₄ = 2 L
Volume of O₂ = 2 L
Volume of CO₂ = ?
Solution:
First of all we will write balance chemical equation.
CH₄ + 2O₂ → 2H₂O + CO₂
Number of moles of CH₄:
PV = nRT
n = PV/RT
n = 1 atm. 2 L / 0.0821 atm. L. mol⁻¹ . K⁻¹ × 273.15 k⁻¹
n = 2 atm . L / 22.43 atm. L. mol⁻¹
n = 0.09 mol
Number of moles of O₂:
PV = nRT
n = PV/RT
n = 1 atm. 2 L / 0.0821 atm. L. mol⁻¹ . K⁻¹ × 273.15 k⁻¹
n = 2 atm . L / 22.43 atm. L. mol⁻¹
n = 0.09 mol
Now we compare the moles of O₂ and CH₄ with CO₂ from balance chemical equation
CH₄ : CO₂
1 : 1
0.09 : 0.09
O₂ : CO₂
2 : 1
0.09 : 1/2×0.09 = 0.045 mol
Volume of CO₂
PV = nRT
V = nRT / P
V = 0.045 mol × 0.0821 atm. L. mol⁻¹ . K⁻¹ × 273.15 k⁻¹ / 1 atm
V = 1.0092 L
Which is approximately equal to 1 L.