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krek1111 [17]
3 years ago
14

Which of these chemical equations demonstrates the law of conservation of mass as it applies to the combustion of ethane? A. 2 C

2 H 6 + 7 O 2 → 4 C O 2 + 6 H 2 O B. C 2 H 6 + 3 O 2 → 2 C O 2 + 3 H 2 O C. C 2 H 6 + 5 O 2 → 2 C O 2 + 3 H 2 O D. 2 C 2 H 6 + 5 O 2 → 4 C O 2 + 4 H 2 O
Physics
1 answer:
WINSTONCH [101]3 years ago
3 0

A. 2 C₂ H₆ + 7 O₂ → 4 C O₂ + 6 H₂ O


according to law of conservation of mass , the total mass of reactants side must be same as the total mass of product side. so we need to check if each atom in the equation has same number on both side of the equation or not.

in this equation , we have

4 atoms of carbon left and 4 atoms of carbon on right

12 atoms of hydrogen on left and 12 atoms of hydrogen on right

14 atoms of oxygen on left and 14 atoms of oxygen on right

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2 years ago
An unmarked police car traveling a constant 95 km/h is passed by a speeder. Precisely 1.00 s after the speeder passes, the polic
Montano1993 [528]

Answer:

Speed of the speeder will be 28 m/sec

Explanation:

In first case police car is traveling with a speed of 90 km/hr

We can change 90 km/hr in m/sec

So 90km/hr=\frac{90\times 1000m}{3600sec}=25m/sec

Car is traveling for 1 sec with a constant speed so distance traveled in 1 sec = 25×1 = 25 m

After that car is accelerating with a=2m/sec^2 for 7 sec

So distance traveled by car in these 7 sec

S=ut+\frac{1}{2}at^2=25\times 7+\frac{1}{2}\times 2\times 7^2=224m

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4 0
3 years ago
Read 2 more answers
How do line symmetry differ from rotational symmetry?.
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Answer:

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3 0
2 years ago
Assume that the home construction industry is perfectly competitive and in long-run competitive equilibrium. It follows that: A.
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Answer:

B. Marginal cost equals long-run average total cost.

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4 0
3 years ago
What is the approximate mass of air in a living room 4.5m×3.4m×2.9m? the density of air is 1.29 kg/m3?
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First we have to calculate the volume of the living room:
V = L x W x H = 4.5 m * 3.4 m * 2.9 m
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m = D · V
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Answer: The approximate mass of air in living room is 57.2 kg.
6 0
3 years ago
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