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At 20⁰ C the vapour pressure of ether is 442 mm of Hg.When 6.1 g of a substance is dissolved in 50g of ether (mol. wt.=74) ,the vapour pressure falls to 410mm .Calculate the molecular weight of the substance?

One liter of water was added to 500 mL of

32% HNO₃ of density 1.20g/mL.What is

the % concentration of HNO₃ in the

solution obtained?

When 400 g of a 20% solution was cooled ,50 g of the solute precipitated. What is %concentration of the remaining solution?

sin X + cos X=root2 sin(pi/4+theta)

sin X + cos

root 2 <pi/2 as root 2=1.414 and pi/2=1.57

sinX + cos X<pi/2

cos X<pi/2-sin X.........................(1)

takin sin on both sides of equation 1 we get the required result

Please rate me if it helped u,

tan 18⁰=sin 18⁰/cos 18⁰

=root5-1/root under (10+2root5.

Please Rate me if u understood

A billiard ball is kept on the table of rough surface.A cue is sharply hit on the ball horizontally at height H from the centre of the ball .The ball moves with initial speed V₀ from the English corner and finally moves with velocity 9/7V₀ where R is the radius of the ball.Where should be hit so that the ball doesn't slip on the surface?

Yes u r right. thanx

A thin spherical shell of radius R lying on a rough horizontal surface is hit sharply and horizontaly by a cue . Where should it be hit so that the shell does not slip on the surface?

I have put but please solve this question

dy/dx=2XY/(X²-Y²)

Can any atom in periodic table contain 1 C of charge? please explain briefly

Can u please solve this question for me,please...

root under a²-b² but please explain

If X/tan(

+

)=Y/tan(

+

)=Z/tan(

+

),prove that

X+Y/X-Y sin²(

-

)=0

If a and b are positive quantities and a

b.Find the minimum positive values of asec

-btan

.