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The mass of a balloon is 0.02g before it is filled with air. After it is blown up with air the mass is 0.04g. Assuming oxygen makes up 21% of air, calculate the number of moles of oxygen in the balloon.

Mass of oxygen in balloon = 0.02 x 0.21 Mr (O2) = 16 x 2 = 32 Moles = mass / Mr = (0.02 x 0.21) / 32 = 1.31 x 10^4 moles Or 0.000131 moles
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Answered by Alice W. • Science tutor
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LAQ: Discuss the extent to which genetics influence behaviour.

According to the third principle of the biological level of analysis behaviour is innate, therefore, to a large extent behaviour has a genetic basis and can be explained using genetics and genetic inheritanc...
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Answered by Iliana M. • Psychology tutor
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Explain how atherosclerosis develops and how it leads to coronary heart disease (8)

-Atherosclerosis: hardening of blood vessels (specifically those that withstand high blood pressure, ie arteries.) Blood vessels are composed of three layers: the tunica intima, tunica media and tunica adven...
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Answered by Iliana M. • Biology tutor
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Explain the Kalãm Cosmological Argument for God's Existence

The Kalãm Cosmological Argument for God's existence was propounded by the medeival Islamic theologian Al-Ghazali (1058-1111), and has recently been revived in modern philosophical discourse through the work ...
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In photosynthesis, what are the products of the Light Dependent reaction, and the Light Independent reaction (Calvin Cycle)?

Light dependent: H 2 0 is split to form: 1/2 O 2 , ATP and NADPH Light Indepedent/Calvin Cycle: CO 2 is used, in the presence of RuBP and Rubisco enzyme to make G3P , which is needed to make sugars, i.e. Glu...
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Answered by Fernando C. • Biology tutor
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