Exam (elaborations)
chem 162
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Exam of 2 pages for the course chem 162 at chem 162 (chem 162)
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CHEM 162 QUESTIONS AND ANSWERS 100% VERIFIEDThe sfollowing sreaction sis sknown sas sthe sHaber sprocess swhich sis sresponsible sfor snearly s80% sof sthe
snitrogen sfound sin shuman stissues, swhich sset sof sconditions swould sgive smore sproduct? s- sHigh
spressure sand slow stemperature
Write sthe sformula sfor sthe sconjugate sbase sfor sHCHO2 s- sCHO2-
Give sthe sdirection sof sthe sreaction, sif sK s<< s1. s- sThe sreverse sreaction sis sfavored.
A s100.0 smL ssample sof s0.10 sM sNH3 sis stitrated swith s0.10 sM sHNO3. sDetermine sthe spH sof sthe
ssolution safter sthe saddition sof s200.0 smL sof sHNO3. sThe sKb sof sNH3 sis s1.8 s× s10-5. s- s1.48
Calculate sthe smolar ssolubility sof smagnesium siodide sin swater sfrom sits sKsp sat s25 s°C. s(Ksp s= s7.9 sx s10-
9) s- s1.25 sx s10-3
What sis sthe spH sof sa sbuffer sthat sis s0.67 sM sHF s(Ka s= s7.0794 sx s10-4) sand s0.35 sM sKF? s- s2.87
What sis sΔn sfor sthe sfollowing sequation sin srelating sKc sto sKp? s
s4 sNH3(g) s+ s3 sO2(g) s⇌ s2 sN2(g) s+ s6 sH2O(g) s- s1
The sequilibrium sconstant sis sgiven sfor sone sof sthe sreactions sbelow. sDetermine sthe svalue sof sthe
smissing sequilibrium sconstant. sH2(g) s+ sBr2(g) s⇌ s2 sHBr(g) sKc s= s3.8 s× s104
s4 sHBr(g) s⇌ s2 sH2(g) s+ s2 sBr2(g) s- s6.9 s× s10-10 ssquare sand sflip sthe sK svalue
Which sof sthe sfollowing sstatements sis sTRUE? s- sDynamic sequilibrium soccurs swhen sthe srate sof sthe
sforward sreaction sequals sthe srate sof sthe sreverse sreaction.
Which sfigure sbest srepresents sthe stitration sof s~0.1 sM sammonia s(NH3) swith s~0.1 sM sHCl? s- sammonia
sis sa sweak sbase, sso sthe stitration sshould sstart saround spH s12, sthen sadding sHCl s(strong sacid) sthe
stitration sshould send saround spH s1. sBoth sanswers sb sand sd sare slinear sand sthus scompletely swrong.
Express sthe sequilibrium sconstant sfor sthe sfollowing sreaction. sP4(s) s+ s5O2(g) s⇌ sP4O10(s) s- s[O2]-5
Ten smilliliters sof s0.10 sM sammonium schloride
sis stitrated swith s0.10 sM ssodium shydroxide. sThe stitration
scurve sis sshown. sWhat sis sthe sapproximate spH sof sthe s
equivalence spoint? s- s9.5
Consider sthe sfollowing sreaction, sequilibrium sconcentrations, sand sequilibrium sconstant sat sa sparticular
stemperature. sDetermine sthe sequilibrium sconcentration sof sSO2(g). s- s6.15 sx s10-6 sM
is sfound sin scarbonated sbeverages sdue sto sthe sreaction sof scarbon sdioxide swith swater. s- sH2CO3, sCO2
s+ sH2O s🡪 sH2CO3
What sis sthe spH sof sa ssolution sof sa sstrong sacid swith sa sconcentration sof s0.01 sM? s- s-log s0.01 s= s2.0
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