The correct answer is b. an element
The explanation:
when the ELEMENT is define as substance that cannot be decomposed (broken down) into simpler substances by ordinary chemical means. Examples: gold, iron, carbon, hydrogen, oxygen, nitrogen
Ex: diamond will be broken into carbon as well.
and SUBSTANCE: Material composed of only one kind of matter throughout (same atoms or same molecules).
Answer : The number of moles of ethane required will be 0.166 mole.
Explanation :
First we have to calculate the heat absorbed by water.

where,
q = heat absorbed = ?
m = mass of water = 851 g
c = specific heat of water = 
= final temperature = 
= initial temperature = 
Now put all the given values in the above formula, we get:

(1 kJ = 1000 J)
Now we have to calculate the moles of ethane required.

where,
= enthalpy of combustion of ethane = 1560.7 kJ/mol (standard value)
q = heat absorbed = 259.67 kJ
n = number of moles of ethane = ?



Therefore, the number of moles of ethane required will be 0.166 mole.
Answer:
Electric and heat
Explanation:
Forms of solar energy include electricity and heat
Answer:
225kg.m.s
Explanation:
Momentum equals to mass times velocity
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As bond energy increases, bond strength generally increases
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