SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the mass of 2.50 mol of oxygen gas O2?
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40 g
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80 g
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16 g
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32 g
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Explanation:
Detailed explanation-1: -The mass of 2.50 mole of oxygen gas ( ) is 80 g.
Detailed explanation-2: -Moles present in 80 grams of Oxygen gas = [80/32] = 2.5.
Detailed explanation-3: -2 moles of Oxygen( O2 ) are given. The mass of one mole of O2 is equal to its molar mass i.e. 32 g. 32 g . Therefore, the mass of 2 moles of O2 is equal to 64 g.
Detailed explanation-4: -1)2.5 moles of Cl2 contains (2.5 * Avogadro no.) Number Of molecules. Now that is equal to 2.5 moles of oxygen, which weighs 32*2.5 grams = 80 grams Hence the mass of oxygen o2 is 80 grams.
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