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Answered a Question in Science
Concentration of `Cl^- ` in solution No.3 = `(4.0 xx 10^-4 xx 3)/(10) ` `mol dm^-3` =`1.2 xx 10^-4` `mol dm^-3` `` Molar mass of `NaoH` = `(23.0+35.5 )` `g.mol^-1` `=58.5 g.mol^-1` The mass of... -
Answered a Question in Math
3x-4y=9-------------(1) 2x+y=6-------------(2) multiply (2) by 4 8x+4y=24----------(3) Then add (1)+(3) 3x-4y+8x+4y=9+24 11x=33 x=33/11 x=3 Let's use x=3 in (2) 2(3)+y=6 6+y=6 y=6-6 y=0 So the... -
Answered a Question in Math
int x^2/(x^2+1)^2 dx To solve this let’s use x=tan(theta) x=tan(theta) so dx=sec^2 theta d(theta) int x^2/(x^2+1)^2 dx = int (tan^2 (theta) . sec^2 (theta))/(1+tan^2 theta)^2 ... -
Answered a Question in Math
`cos^2 x . tanx = (2sinx)/(secx+cosx+sin^2 x . sec x)` `cos^2 x . tanx` `=> cos^2 x. (sinx/cosx) ` =cosx. sinx ----(1) `(2.sinx)/(sec x+cosx+sin^2 x sec x)` `(2.sinx)/((1/cos x) + (cosx) +... -
Answered a Question in Science
`KMnO_4+H_2 SO_4+NaHSO_3` `4KMnO4+H_2SO_4+10NaHSO_3 = 4MnSO_4+2K_2SO_4+ 5Na_2SO_4+6 H_2O` `KMnO_4+NaOH+NaHSO_3` `2KMnO_4+3NaOH+NaHSO_3 = K_2SO_4+2Na_2MnO_4+2H_2O` `KMnO_4+NaHSO_3` `KMnO_4 +...
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