Which of the following is an essential condition for a combustion reaction ?
2 answers:
Answer: Option (b) is the correct answer.
Explanation:
A combustion reaction is defined as the reaction in which a substance chemically reacts in the presence of oxygen.
A combustion reaction is always exothermic in nature as heat is released. Also, carbon dioxide and water will be produced in a combustion reaction.
For example,
Therefore, we can conclude that an essential condition for a combustion reaction is that oxygen is a reactant.
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Answer: There are 0.000043 moles of melatonin.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number of particles.
To calculate the moles, we use the equation:
given mass = 10 mg = 0.01 g
molar mass of = 232.28 g
Thus there are 0.000043 moles of melatonin