OBJECTIVE LIFE SCIENCE
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How many molecules of water are represented in the following equation:C2H4 + 2O2®2H2O + 2CO2?
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4
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3
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2
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1
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Explanation:
Detailed explanation-1: –Molecules = moles * Avogadro’s number = 0.004 moles * 6.022 x 10^23 molecules/mol = 2.408 x 10^21 molecules So, the answer is approximately 2.4 x 10^21 molecules of water of hydration.
Detailed explanation-2: -The actual reaction to make water is a bit more complicated: 2H2 + O2 = 2H2O + Energy. In English, the equation says: To produce two molecules of water (H2O), two molecules of diatomic hydrogen (H2) must be combined with one molecule of diatomic oxygen (O2). Energy will be released in the process.
Detailed explanation-3: -A coefficient multiplies the number of atoms of each element indicated in a chemical formula. Thus, 2H2O represents four H atoms and two O atoms.
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