2:20 AM people.ucsc.edu iPad 2. Here we\'re going to consider a simplified solar

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2:20 AM people.ucsc.edu iPad 2. Here we're going to consider a simplified solar system which consists of three components: hydrogen (H2), ice (H20) and silicate (MgSiO) For every 106 Si or Mg atoms, there are 2.1x10 O atoms available a) For every 10" silicate molecules produced, how many O atoms are left over? (1) b) Assume that all these remaining O atoms are converted into H20 molecules (hydrogen is effectively unlimited). How many H20 molecules are generated? (1) c) What is the ratio of the mass of H20 molecules to the mass of silicate molecules produced? Atomic weights are: H-1, 0-16, Mg 24, Si-28. (3) d) Explain why your answer to c) is consistent with the fact that the outer solar system contains larger planets than the inner solar system. (3) e) The mass of H2 in the initial solar nebula was about 300 times the mass of the silicates. If the mass of silicates in the present-day solar system is about 15 Earth masses, what mass of H2 was present in the initial solar system? What fraction of the present-day mass of the Sun (2x1030 kg) is this? (2)

Explanation / Answer

since you havent mentioned which questions are to be done, i am doing the first four

a) since silicate molecule takes two oxygen atoms therefore total oxygen atoms used are, 2*106, hence the left oxygen atoms are 1.9*107

b) 1.9*107 is the number of H2O molecules that are created

c)molecular mass of H2O is 18 and SiO2 is 60, multiplying them with the number of molecules we found in above answers and then dividing them we get H2O:SiO2= 5.7:1

d) since the lighter material goes beyond, H2O and other lighter gases which were far more in quantity that heavier material like silicate got incorporated in farther planets hence making them larger

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