Portage Learning CHEM 104 Week 1
Module 1: Problem Set With Correct
Answers
Show cyour cwork cand cbe csure cto cgive canswer cwith cthe ccorrect cunits.
In cthe creaction cof c0.200 cM cgaseous cN2O5 cto cyield cNO2 cgas cand cO2 cgas cas
cshown cbelow:
2 cN2O5 c(g) c→ c4 cNO2 c(g) c+ cO2 c(g)
the cfollowing cdata ctable cis cobtained:
Time c(sec)
[N2O5]
[O2]
0
0.200 cM
0
300
0.180 cM
0.010 cM
600
0.162 cM
0.019 cM
900
0.146 cM
0.027 cM
1200
0.132 cM
0.034 cM
1800
0.110 cM
0.045 cM
2400
0.096 cM
0.052 cM
3000
0.092 cM
0.054 cM
, (a) cUse cthe c[O2] cdata cfrom cthe ctable cto ccalculate cthe caverage crate cover cthe
cmeasured ctime cinterval cfrom c0 cto c3000 csecs.
(b) cUse cthe c[O2] cdata cfrom cthe ctable cto ccalculate cthe cinstantaneous crate cearly cin
cthe creaction c(0 csecs cto c300 csec).
(c) cUse cthe c[O2] cdata cfrom cthe ctable cto ccalculate cthe cinstantaneous crate clate cin
cthe creaction c(2400 csecs cto c3000 csecs).
(d) cExplain cthe crelative cvalues cof cthe caverage crate, cearly cinstantaneous crate cand
clate cinstantaneous crate. c- cCORRECT cANS✔✔(a) cThe caverage crate cover cthe
cmeasured ctime cinterval cfrom c0 cto c3000 csecs cis:
rate c= c∆[O2] c/ c∆t c= c(0.054 c- c0) c/ c3000 c- c0 c= c1.80 cx c10-5 cmol/L•s
(b) cThe cinstantaneous crate cearly cin cthe creaction cfrom c0 cto c300 csecs cis:
rate c= c∆[O2] c/ c∆t c= c(0.010 c- c0) c/ c300 c- c0 c= c3.33 cx c10-5 cmol/L•s
(c) cThe cinstantaneous crate clate cin cthe creaction cfrom c2400 cto c3000 csecs cis:
rate c= c∆[O2] c/ c∆t c= c(0.054 c- c0.052) c/ c3000 c- c2400 c= c3.33 cx c10-6 cmol/L•s
(d) cIt ccan cbe cseen cthat cthe cearly cinstantaneous crate cis cthe clargest csince cthe
cconcentrations cof creactants cis chighest cduring cthe cearliest cstages cof cthe creaction
cand cthe clate cinstantaneous crate cis csmallest csince cthe cconcentrations cof creactants
cis clowest cduring cthe clate cstages cof cthe creaction.
Show cyour cwork cand cbe csure cto cgive canswer cwith cthe ccorrect cunits.
The cfollowing crate cdata cwas cobtained cfor cthe creaction:
2 cClO2 c+ c2 cOH- c→ cClO3- c+ cClO2- c+ cH2O
Experiment c# c[ClO2] c[OH-] crate
1 c0.060 c0.030 c2.48 cx c10-2
2 c0.020 c0.030 c2.76 cx c10-3
3 c0.020 c0.090 c8.28 cx c10-3
Determine cthe creaction corder cwith crespect cto c(1) cClO2 cand c(2) cOH-, c(3) cwrite cthe
crate claw cand cthen c(4) cdetermine cthe cvalue cof cthe crate cconstant, ck. c- cCORRECT
cANS✔✔Rate c= ck c[ClO2]x c[OH-]y
If cdata cfrom cexperiments c1 cand c2 cwas csubstituted cinto cthe cequation cwe cwould
cobtain
2.48 cx c10-2 c= ck c[0.060]x c[0.030]y
2.76 cx c10-3 ck c[0.020]x c[0.030]y
and cif cwe ccancel call ccommon cterms cwe cwould cobtain
2.48 cx c10-2 c= ck c[0.060]x c[0.030]y
2.76 cx c10-3 ck c[0.020]x c[0.030]y
2.48 cx c10-2 c= c[0.060]x c9 c= c(3)x
2.76 cx c10-3 c[0.020]x
(1) cwhich cyields cx c= c2 cas cthe corder cof creaction cwith crespect cto cClO2
Module 1: Problem Set With Correct
Answers
Show cyour cwork cand cbe csure cto cgive canswer cwith cthe ccorrect cunits.
In cthe creaction cof c0.200 cM cgaseous cN2O5 cto cyield cNO2 cgas cand cO2 cgas cas
cshown cbelow:
2 cN2O5 c(g) c→ c4 cNO2 c(g) c+ cO2 c(g)
the cfollowing cdata ctable cis cobtained:
Time c(sec)
[N2O5]
[O2]
0
0.200 cM
0
300
0.180 cM
0.010 cM
600
0.162 cM
0.019 cM
900
0.146 cM
0.027 cM
1200
0.132 cM
0.034 cM
1800
0.110 cM
0.045 cM
2400
0.096 cM
0.052 cM
3000
0.092 cM
0.054 cM
, (a) cUse cthe c[O2] cdata cfrom cthe ctable cto ccalculate cthe caverage crate cover cthe
cmeasured ctime cinterval cfrom c0 cto c3000 csecs.
(b) cUse cthe c[O2] cdata cfrom cthe ctable cto ccalculate cthe cinstantaneous crate cearly cin
cthe creaction c(0 csecs cto c300 csec).
(c) cUse cthe c[O2] cdata cfrom cthe ctable cto ccalculate cthe cinstantaneous crate clate cin
cthe creaction c(2400 csecs cto c3000 csecs).
(d) cExplain cthe crelative cvalues cof cthe caverage crate, cearly cinstantaneous crate cand
clate cinstantaneous crate. c- cCORRECT cANS✔✔(a) cThe caverage crate cover cthe
cmeasured ctime cinterval cfrom c0 cto c3000 csecs cis:
rate c= c∆[O2] c/ c∆t c= c(0.054 c- c0) c/ c3000 c- c0 c= c1.80 cx c10-5 cmol/L•s
(b) cThe cinstantaneous crate cearly cin cthe creaction cfrom c0 cto c300 csecs cis:
rate c= c∆[O2] c/ c∆t c= c(0.010 c- c0) c/ c300 c- c0 c= c3.33 cx c10-5 cmol/L•s
(c) cThe cinstantaneous crate clate cin cthe creaction cfrom c2400 cto c3000 csecs cis:
rate c= c∆[O2] c/ c∆t c= c(0.054 c- c0.052) c/ c3000 c- c2400 c= c3.33 cx c10-6 cmol/L•s
(d) cIt ccan cbe cseen cthat cthe cearly cinstantaneous crate cis cthe clargest csince cthe
cconcentrations cof creactants cis chighest cduring cthe cearliest cstages cof cthe creaction
cand cthe clate cinstantaneous crate cis csmallest csince cthe cconcentrations cof creactants
cis clowest cduring cthe clate cstages cof cthe creaction.
Show cyour cwork cand cbe csure cto cgive canswer cwith cthe ccorrect cunits.
The cfollowing crate cdata cwas cobtained cfor cthe creaction:
2 cClO2 c+ c2 cOH- c→ cClO3- c+ cClO2- c+ cH2O
Experiment c# c[ClO2] c[OH-] crate
1 c0.060 c0.030 c2.48 cx c10-2
2 c0.020 c0.030 c2.76 cx c10-3
3 c0.020 c0.090 c8.28 cx c10-3
Determine cthe creaction corder cwith crespect cto c(1) cClO2 cand c(2) cOH-, c(3) cwrite cthe
crate claw cand cthen c(4) cdetermine cthe cvalue cof cthe crate cconstant, ck. c- cCORRECT
cANS✔✔Rate c= ck c[ClO2]x c[OH-]y
If cdata cfrom cexperiments c1 cand c2 cwas csubstituted cinto cthe cequation cwe cwould
cobtain
2.48 cx c10-2 c= ck c[0.060]x c[0.030]y
2.76 cx c10-3 ck c[0.020]x c[0.030]y
and cif cwe ccancel call ccommon cterms cwe cwould cobtain
2.48 cx c10-2 c= ck c[0.060]x c[0.030]y
2.76 cx c10-3 ck c[0.020]x c[0.030]y
2.48 cx c10-2 c= c[0.060]x c9 c= c(3)x
2.76 cx c10-3 c[0.020]x
(1) cwhich cyields cx c= c2 cas cthe corder cof creaction cwith crespect cto cClO2
