Chemistry, 13.10.2019 10:50 kaylamorris05

How many atoms are there in 5.10 moles of sulfur?

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5.10x(6.022x10^23)=3.07x10^24(Reference: Chang 3.13)2. How many moles of calcium (Ca) atoms are there in 77.4 g of Ca?(6 points)(Reference: Chang 3.15)77.4g Ca*1 mol/40.1gCa=1.93 mol Ca3.What is the mass in grams of 1.00 × 1012lead (Pb) atoms?(8 points)1.00x10^12x207.2/6.02x10^23=3.44gx10^-10(Reference: Chang 3.19)4.Describe how you would determine the isotopic abundance of an element from itsmass spectrum.(6 points)Mass Spectrometer(Reference: Chang 3.32)5.Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics.Its molecular formula is C9H10O.a.Calculate the percent composition by mass of C, H, and O in cinnamic alcohol.

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answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form( $n_2$ ) .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

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