The rate of effusion of a particular gas whas measured to be 40ml/min. Under same condition the rate of effusion of pure methane was 20ml/min. Then find molar mass of gas.
A. 4amu
B. 2amu
C. 4gm
D. 2gm
1 Answers
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The rate constant of a first order reaction at `27^(@)C "is" 10^(-3)"min"^(-1)`.The constant ( in `"min"^(-1)`) at `17^(@)C` for this reaction ?
Correct Answer - B `(k_(T_(2)))/(k_(T_(1)))=(mu)^(DeltaT//10)` `(10^(-3))/(k_(T_(1)))=(mu)^(10//10)=2` `k_(T_(1))=(10^(-3))/(2)=0.5xx10^(-3)=5xx10^(-4)"min"^(-1)`
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`T_(50)` of first order reaction is 10 min. starting with 10 `"mol"^(-1)` rate after 20 min is :
Correct Answer - B Remainin concetration of reactant after 20 min `=(1)/(4)xx102.5"mol"L^(-1)` `"Rate"=kxx["Reactant"]=(0.693)/(t_(1//2))xx["Reactant"]` `=(0.693)/(10xx2.5=0.0693xx2.5 "mol"L^(-1) min^(-1)`
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`20mL` of `0.2M NaOH` are added to `50mL` of `0.2M` acetic acid `(K_(a)=1.85xx10^(-5))` Take `log2=0.3,log3=0.48` (1) What is `pH` of solution? (2) Ca
`{:(,NaOH+,CH_(3)COOHrarr,CH_(3)COONa+,H_(2)O),("Millimole added",20xx0.2,50xx0.2,,),(,=4,=10,0,0),("Millimole after reaction",0,6,4,4):}` `{"Molarity"}=("millimole")/("Total volume")` `[CH_(2)COOH]=(6)/(70)` &`[CH_(2)COONa]=(4)/(70)` rArr Buffer solution consisting of a weak acid & its salt with a strong base. (2) Let `V mL` of `0.2M NaOH`...
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`H_(2)C_(2)O_(4)overset(Delta)toCO+CO_(2)+H_(2)O` `CO+Cl_(2)toCOCl_(2)overset(NH_(3).Delta)to NH_(2)CONH_(2) overset(NH_(3).Delta)larr CO_(2)`
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In a gobar gas plant, gobar gas is formed by bacterial fermentation of animal refuse. It mainly contains methane and its heat of combustion is `-809kJ
Energy consumption of 50 families per day `=50xx20,000kJ=1xx10^(6)kJ` 809 kJ of energy is obtained by burning methane=16g `1xx10^(6)kJ` of energy will be obtained by burning methane `=(16)/(809)xx10^(6)=1.98xx10^(4)g` `=19.8kg` Since, methane...
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A natural gas may be assumed to be a mixture of methane and ethane only. On complete combustion of `10L` of gas at `STP` the heat evolved was `474.6 k
x litre `toCH_(4)," mole of "CH_(4)=x//22.4` `(10-x)litre to C_(2)H_(6)," mole of "C_(2)H_(6)=(10-x)//22.4` Heat evolved `=(x)/(22.4)xx894+((10-x))/(22.4)xx1500` `474.6=(x)/(22.4)xx894+((10-x))/(22.4)xx1500` `x=0.745,%CH_(4)=74.5%`
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A mixtures of methane and ethylene in the volume ration x:y has total volume of 30mL. On complete combustion it gave 40mL of `CO_(2)`. IF the ratio of
Correct Answer - A Combustion of `CH_(4) and C_(2)H_(4)` may be represented as. `"Combustion of "CH_(4) "may be represented as",` `underset(xmL)(CH_(4)(g))+2O_(2)(g) to underset(xmL)(CO_(2)(g))+2H_(2)O(g)` `underset(ymL)(C_(2)H_(4)(g))+3O_(2)(g) to underset(ymL)(2CO_(2)(g))+2H_(2)O(g)` Given, x+y=30 x+2y=40 `therefore x=20,...
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What volume of oxygen gas `(O_(2))` measured of `0^(@)C` and `1 am` needed to burn completely `1 L` of propane gas `(C_(3) H_(8))` measured under the
Correct Answer - A `underset(1 "L")underset(1"vol")(C_(3)H_(8))(g) + und
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Calculate relative rate of effusion of `O_(2)` to `CH_(4)` through a container containing `O_(2)` and `CH_(4)` in 3:2 mass ratio:
`(r_(o_(2)))/(r_(CH_(4)))=(n_(o_(2)))/(n_(CH_(4)))=sqrt((M_(CH_(4)))/(M_(O_(2))))` `=(3)/((2)/(2))=sqrt((16)/(32))` `=(3)/(4sqrt(2))`
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If two gases are taken at same temperature, the density of a gas A is three times that of gas B, while molecular mass of gas B is twice that of A. The
PM=dRT `(PM)/(d)=` constant (for constant T) `(P_(A)M_(A))/(d_(A))=(P_(B)M_(B))/(d_(B))` `(P_(A))/(P_(B))=(d_(A))/(d_(B))xx(M_(B))/(M_(A))=3xx2=6`
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