Questions asked by MG
 Back to user's profile

40g of NaOH is added to water to create 1 L of solution. The resulting solution has a SG of
1.07.
a) Calculate the mass (in lb) of 1 L of solution?
b) Calculate the molecular mass of NaOH?
c) Calculate the molarity of NaOH in the solution.?

Calculate the weight proportion of H2O in Na2S2O2.5H2O?

The solubility of manganese(II) sulphate at 20oC is 62.9g/100g H2O. How many grams of manganous(II)sulphate pentahydrate crystal must be added to 51L H2O to make a saturated solution?

Sec theta = 2 to rectangular coordinates??

How do I express #(2^x)1=2/(2^x)# as a quadratic equation, and show that only one real solution, #x=1#, exists?

If #3^m = 2 and 4^n =27#, show by laws of indices that #m xx n =3/2#??

X=xoe^(bwt)*(cos(wt)+b/(sqrt(1b)sin(wt)). units of x is mm, t in s. What are the units of w and b?

Rationalise Denominator:
1/(1 + √2 + √3) by using:
(1  √2 + √3) as conjugate?

16y^2x^26x9. How can I factorise this? I know that (x^2+6x+9) is equal to (X+3)^2, and 16y^2 can be written as (4y)^2 but I can't quite get the solution (4yx3)(4y+X+3)

Can you write
#(a+b)^0.5  (ab)^0.5#
as the square root of a difference?

Vector A, A = 44m @ 28° to + xaxis, and Vector B, B = 26.6m @ 124° to the + xaxis.
Determine the magnitude and direction of R = B  2A ??

A car with speed #v = "20 ms"^(1)# passes a stopped police car. Right at this point, the car accelerates at #"2 ms"^2# and the police car at #2a#. Show that, when the police car catches up to the other car, the distance is #d=(4v^2)/a#?

x^2  2 < 1
Please can anyone help?
How to solve this absolute value problem?

Can someone please help me with this absolute value inequality, can I draw a graph for it?
#(x+4)/(x+2)<=1#?

Show that: #nCr = n1Cr + n1Cr1# ??

For the circle,
#(x+1)^2+(y+2)^2=25#
What is the length of the tangent to the circle from the point #(6,4)#?

Find the equation to the circle such that the points #A(3,5)# and #B(4,2)# form the ends of a diameter?

For what values of #m# is line
#y=mx# tangent to the hyperbola
#x^2y^2=1#?

I get a solution of #y=3# but how to solve for this limit??
#lim(x>4)(3x+12)/(x+4)#

Question 3 part 2 and 3 please?