HELP college chemistry problem: Atomic theory involved!??

Question

Suppose 12.0g of carbon (C) reacts with 70.0g of sulfer (S) to give 76.0g of the compound carbon disulfide (CS2). in this process, all the carbon gets used up, but some elemental sulfer is left over.

a) for the law of conservation of matter to be obeyed, how much sulfer is unused?

b) What is the percent C in CS2?

c) What is the percent S in CS2?

d) what is the sum of the %C and %S in CS2?

Answer 1

a)moles of sulphur used = 1.9983348mol
moles of sulphur left = 0.1854954mol
mass of sulphur unused = 32.066g/mol *0.1854954mol = 5.9480955g


b) 15.77%

c) 84.23

d) 15.77 + 84.23 =100%

Answer 2

Bohr replaced right into a theoretician (and a tremendously good one at that) and that i don't think of he's asserted for any surprising experimental artwork. yet once you study your assertion heavily it somewhat is, what test did he use not an test that he achieved. The test replaced into the atomic emission spectrum of hydrogen atoms that is composed as you be responsive to of basically specific frequencies emitted.[a million] This defied clarification, i've got self assurance, for over 50 years earlier Bohr proposed that basically specific quantized ranges have been obtainable for the e- in H to undertake (he additionally knew of Rutherford's experiments that confirmed that atoms have been particularly empty area that's amazingly extraordinary in case you think of roughly it). and what's purely as important is that as quickly as an e- dropped from a much better point to a decrease point it emitted a photon of a particular frequency that corresponded to the potential distinction between the ranges. And his theoretical consequences agreed completely with test. the only subject replaced into that it wasn't terrific suited, in spite of if it actual represented a extensive bounce forward for quantum mechanics.