C818 + _ 02 → __CO2 + __ H2O
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Ответ:
2C₈ H₁₈ + 25O₂ → 16CO₂ + 18H₂O
Explanation:
The given expression:
C₈ H₁₈ + O₂ → CO₂ + H₂O
We need to balance the expression so that mass is conserved.
One approach is to use a mathematical method;
aC₈ H₁₈ + b O₂ → cCO₂ + d H₂O
a, b , c and d are the coefficients that will balance the expression:
Conserving C;
8a = c
Conserving H;
18a = 2d
Conserving O;
2b = 2c + d
Now let a = 1;
c = 8
d = 9
2b = 2(8) + 9
2b = 25
b =
Multiply through by 2 to give whole numbers:
a = 2, b = 25, c = 16, d = 18
2C₈ H₁₈ + 25O₂ → 16CO₂ + 18H₂O
Ответ:
when the ground is very hot and the air is cool.
Explanation:
The hot earth warms a layer of air right above the ground. Light is refracted as it passes through the cool air and onto the hot air sheet (bent). A coating of very warm air near the earth bends the light from the sky almost into a U-shaped bend.