The element calcium has a total of four energy levels<span> that each can hold a certain number of electrons. Its first and fourth energy levels hold two electrons each, and its second and third energy levels hold eight electrons each.</span>
A girl cycles for 3.00 hrs at a speed of 40.0 km/h. What distance did she ... A train travels at a speed of 30.0 km/hr and travel a distance of 240 km.. How long did it take the ... If a car travels 400 m in 20 seconds how fast is it going? Givens ... is in m/s2. 1. A man hits a golf ball (0.2 kg) which accelerates at a rate of 20 m/s2.
Answer:
9842kJ of energy are released
Explanation:
Based on the reaction:
2 C₄H₁₀ (g) + 13 O₂ (g) → 8 CO₂(g) + 10 H₂O (g) + 5720 kJ
<em>When 2 moles of C₄H₁₀ react with 13 moles of O₂ there are released 5720 kJ of energy</em>
As molar mass of C₄H₁₀ is 58.12g/mol, moles in 200.0g of the hydrocarbon are:
200.0g C₄H₁₀ ₓ (1mol / 58.12g) =<em> 3.441 moles of C₄H₁₀</em>
<em> </em>
As 2 moles of C₄H₁₀ release 5720kJ of energy, 3.441 moles of C₄H₁₀ release:
3.441 moles C₄H₁₀ ₓ (5720kJ / 2 moles C₄H₁₀) = <em>9842kJ of energy are released</em>
Answer:
Option (A)
Explanation:
The correlation of rocks is usually defined as a technique that helps in determining the age of the rocks that are mostly characterized by the presence of similar fossil/fossil assemblages. These fossils that are used are mainly the index fossils that appeared for a short geological time and were very widely distributed on earth's surface. By determining the age of these fossils, the rocks in which these fossils are found were concluded to be formed during the same age.
This method is efficient to use for the geologists where the fossils acts as a tool to determine the age of the rocks. For the correlation of rocks, scientists look for a similar type of fossils that are found in different places.
Thus, the correct answer is option (A).
