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# Stoichiometry (Grades 11-12)

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## Stoichiometry

1.
If $W_2$ is the weight of solute in grams or Kgs and $W_1$ is the weight of solvent in grams or kgs, then what is the concentration of such a solution in parts per million (ppm)?
1. Parts per million (ppm) = $(W_2)/(W_1 + W_2) xx 10^6$
2. Parts per million (ppm) = $[(W_1 + W_2)/W_1] xx 10^-3$
3. Parts per million (ppm) = $(W_1)/(W_1+W_2) + 10^2$
4. parts per million (ppm) = $(W_2)/ (W_1 -W_2) xx 10^5$

2.
A sample of KCl weighing 10 g is dissolved in 200 mL of water. What is the weight percent of KCl in the solution (density of water = 1 g/mL)?
1. 4.76%
2. 4.53%
3. 4.95%
4. 4.85%
3.
Calculate the mass of sodium in kilograms present in 95 kilograms of a crude sample of sodium nitrate, whose percentage purity is 70%.
1. 17.99 Kg
2. 16.56 Kg
3. 18.35 Kg
4. 11.25 Kg

4.
What do you term the ratio of the mass of the solution to the mass of an equal volume of water at a specified temperature?
1. Specific gravity
2. Density
3. Molarity
4. Molality
5.
If W grams of solute, having an equivalent weight E, is dissolved in V liters of the solution, what is the expression of normality (N) in this case?
1. $N = (W/E) (1/V)$
2. $N = (WE)/V$
3. $N = (WV)/E$
4. $N = (EV)/W$

6.
The concentration expressed in terms of mole fraction and molality is independent of temperature.
1. True
2. False
7.
How many grams of NaOH are present in 1 mole of NaOH?
1. 40 grams
2. 50 grams
3. 60 grams
4. 70 grams

8.
The mole is based on
1. speed of light.
2. Planck's constant.
3. pi.