Calculate the amount of sugar dissolved in `10^(-3)m^(3)` of water so as to produce ratation of plane of polarisation of `12^(@)`. Given the specific rotation of sugar solution is`0.01 rad m^(-1) kg^(-1) m^(3)` and length of polarimeter tube is 0.21m
1 Answers
Calculate the enthalpy change when one mole of `HCl(g)` is dissolved in a very large amount of water at `25^(@)C`. The change in state is: `HCl(g)+arr
For the reaction, `HCl(g)+aq rarrH^(+)(aq)+Cl^(-)(aq)` we have `Delta H^(@)+Delta_(f)H^(@)(Cl^(-),aq)-Delta_(f)H^(@)(HCl,g)` `Delta H^(@)=[-167-(-92)]KJ mol^(-1)= -75KJ mol^(-1)`
2 Answers 1 views
What amount of ice will remains when 52 g ice is added to 100 g of water at `40^(@)C`? Specific heat of water is 1 cal/g and latent heat of fusion of
Correct Answer - 2 g ice At the stage of thermal equilibrium at `0^(@)C` heat lost by water=Heat absorbed by ice to melt. `msDeltaT=mL` `100xx1xx40=mxx80` `m=50g` Remaining ice`=52-50=2g`
2 Answers 1 views
Calculate the magnitude of free energy in `KJ mol^(-1)` when `1` mole of a an ionic salt MX (s) is dissolved in water at `27^(@)C` . Given Lattice ene
Correct Answer - `-7 KJ "mol"^(-1)` `DeltaH_("dissolution") = DeltaH_(("ionisation")) + DeltaH_(("Hydration")) = 780-77505 KJ mol^(-1)` `DeltaG_("dissolution") = DeltaH_("dissolution") - TDeltaS_("dissolution") = 5000- 300 xx 40=-7000 J =-7 KJ mol^(-1)`
2 Answers 2 views
Consider the following sets: A = set all rectangles in the same plane B = set all squares in the same plane C = set all parellegrams in the same plane
We have A = set all rectangles in the same plane B = set all squares in the same plane C = set all parellegrams in the same plane. Since...
2 Answers 1 views
Calculate the boiling point of solution when 4g of Mg `SO_(4) (M=120g "mol"^(-1))` was dissolved in 100g of water, assuming `MgSO_(4)` undergoes compl
`DeltaT_(b) = iK_(b) xx m` `T_(S)- Ti = (i xx 0.52 xx WB)/(M_(g) xx W_(A)(Kg))` `i=2, M_(B) = 120 g//"mol" W_(B) = 4g, W_(A) = 100` `T_(S) - 100= (2...
2 Answers 1 views
Calculate the specific rotation of sugar solution from the following data: length of the polaimeter tueb=0.21 concentration of sugar solution =`80kgm^
Correct Answer - `0.01rad m^(-1)kg^(-1)m^(3)`
2 Answers 1 views
A 22cm long tube containing 88cc of sugar produces an optical rotation of `9.9^(@)` when placed in a polarimeter. If the amount of sugar in the soluti
Correct Answer - `66^(@)//"decimetre g" cm^(-3)`
2 Answers 1 views
A 0.12kg of impure sugar is dissolved in water and solution is mad eupto `8xx10^(-4)m^(3)`. A length of 20cm of this solution causes a rotation of `15
Correct Answer - 0.853
2 Answers 1 views
A polarimeter tube of length 0.21m contains sugar solution of specific rotation 0.01 rad `m^(-1)kg^(-1)m^(3)` concentration. If the produced is `36^(@
Correct Answer - `299 kgm^(-3),18^(@)`
2 Answers 1 views
i. Dissolve a given amount of sugar in minimum amount of water at room temperature.
Observation : Sugar crystals separate out. Inference : The sugar syrup solution prepared is a saturated solution. Therefore, Additional amount of sugar cannot be dissolved in it at room temperature. In a saturated solution, There exists...
2 Answers 1 views