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Question 9 (2 points) The atomic mass of fluorine is 19.00 amu, and all fluorine atoms in a naturally occurring sample of fluorine have this mass. The atomic mass of chlorine is 35.45 amu, but no chlorine atoms in a naturally occurring sample of chlorine have this mass. Provide an explanation for this difference. a) All fluorine atoms have an equal number of protons and neutrons. Ob) There is more than one isotope of chlorine. Oc) Fluorine and chlorine are isoelectronic with each other. d) All chlorine atoms have an equal number of protons and neutrons. Question 10 (2 points) When 3.842 kJ of heat are supplied to an 186.90 g sample of an unknown metal, ist temperature rises from 20.50°C to 63.96°C. Using this information, give the most likely identity of this unknown metal. (q-m.s.AT) a) copper, scu - 0.385 J/gºC b) aluminum, SAI - 0.900 J/gºC Oc) iron, Sfe - 0.473 J/g°C d) lead, spb -0.128 J/g°C

Answer 1

9) the reason for this difference is that there is more than one isotope of chlorine the formula: 10) using q=mxs x AT 3.842x103J 186.909x 1 X SX (63.96- 20:50)°c 3.842x1035 » 186.9094 -909x Sx 43.46°C .. Sa 3.842x10's /186.909x 43.46€ S= 0.4733/gc Where S= specific heal Herce; the unknown metal is Iron of metal Ste = 0.4733 19% 13) As we know: X Volume density = mass / volume : mass of cyclohexane density & = 0.779 g/ m x 62.8 mi 48.929 moles of cyclohexane 48.929/ 84.16gl mot = 0.58 mol Number molecules = 0.58% 6-622 x 1823 molecules = 3.50 x 1023 molecules.