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A room with dimension of 3m x 12m x 3.5m, and under indoor condition of 1 bar and 25 degree C dry bulb. If 500 gram of xylene (MW=106.2) are evaporated uniformly over 4 hrs shift.

Determine

a) the volume flow rate of the xylene vapour formed in m3/s? (7.894x10^-4 m3/s)

b) the air volume flow rate in m3/s required for dilution with xylene vapour formed to 25ppm, if kmixing is 1.5? (0.479m3/s)

c) the airflow in ACH? (13.7)

Find the pH of a mixture of 40cm3 of 0.2 mol/dm3 HCl and 40cm3 of 0.1 mol/dm3 NaOH.

Ans: pH 1

2) An impure solution of NaCl contains CaCl as the main impurity. This impurity can be removed by reacting the solution with X, followed by filtration. What could X be?

Option:

1) Lithium Nitrate

2) Sodium Sulphate

3) Aq Sodium Sulphate

4) Aq Lithium Nitrate

A known mass of Mg ribbon was dissolved in 25cm^3 of 4mol/dm3 H2SO4, producing 100cm3 of gas @ r.t.p. What volume of gas @ r.t.p would be produced if the same mass of Mg was dissolved in 50cm3 of 1mol/dm3 of H2SO4?

You are my everything, my everything is you

You are my everything, my everything is you

You are my everything, my everything is you......

Can i forget which phase i see, it brings back the memory being with you....

If (ax + b)(cx + d) =6x^2 + kx + 5,

find the two possible sets of integer values of the constants a, b , c, d and k.

8 gram of X2O3, an oxide of element x, contains 5.6 gram of X. How many moles of X does 5.6 gram of the element contain?

a man always wants to make at least 25% profit from selling his furniture even though he offers a discount of 35% off the marked up price. If he bought a chair for $50, deteremine the minimum amount he should mark up the price which he always ends with $9.99.

Ans is $99.99

A rectangular box has a surface area of 100cm2. What is the surface area of an identically shaped box whoses volume is 27 times as big. Ans is 900cm3

if p workers can paint p chairs by working p hour a day for p days. How many chairs can be painted by q workers by working q hours a day for q days.

ans is q^3/P^2

If Ted gives leena $3, both of them will have the same amount of money...If leena gives ted $3, ted will have twice the amount of money leena has..how much do ted has? Ans: $21/=

In a shop, the price of a T-shirt is $30/=. During a promotion, buy 2 t-shirts and get 1 free. Find the actual discount percentage when buy 4 t-shirt... Ans: 25 %

The product of the ages of a group of teenagers (13 - 19 yrs old) is 4590 yrs. FInd the nos of the teenager in the group and the sum of their age..

The HCF of two numbers is 1 and the LCM of these two numbers is 91. Write down the two numbers.

Explain why. thanks.

The HCF of two numbers is 1 and the LCM of these two numbers is 91. Write down the two numbers.

Judy and Bobby each have some oranges.

If Judy sells 50 oranges per day and Bobby sells 25 oranges per day, she'll still have 500 oranges left when Bobby sold all.

If Judy sells 20 per day and Bobby sold 40 per day, Judy will have 800 oranges left.

a) How many oranges do Judy have?

Ans: 900

b) How many oranges do Bobby have?

Ans: 200

Zack has some money. He spends $10 on 3 books and 7 pencils. He is short of $0.40 if he buy 1 more book and left $0.60 if buy 1 more pencil.

a) How much is the book?

b) How much do Zack have?

Clare has 30% as much money as Jane.

Jane has 80% as much money as Ali.

Ali spent $640 and the amount of money left by Ali is 1/4 of Jane. How much more money did Ali than Clare have at first?

R, S and T shared some stamps. R received 150% of what S received plus 6 more. T received 1/3 of what R received plus 4 more. T received 2 stamps less than S.

a) What % of the stamps did R receive? Ans: 50%

b) How many stamps would S have to give T so that both of them have the same numbers of stamps? Ans: 1 stamp

R, S and T shared some stamps. R received 150% of what S received plus 6 more. T received 1/3 of what R received plus 4 more. T received 2 stamps less than S.

a) What % of the stamps did R receive? Ans: 50%

b) How many stamps would S have to give T so that both of them have the same numbers of stamps? Ans: 1 stamp