Please help with this chemistry assignment. All Calculations must be shown 2. A.
ID: 841580 • Letter: P
Question
Please help with this chemistry assignment.
All Calculations must be shown
2. A. Why is it that when CO2 dissolves in water the pH decreases?
B. Why is a solution of methyl amine, CH3NH2,in water basic?
3. A solution contains 2.0x10-8 moles of H+ ion in 10.0 liters
A.What is the pH? B. What is the [OH-] C. What is the pOH ?
D. Is the solution acidic or basic ?
4. What is the pressure in atmospheres of 512g of N2 gas in an 12.00L
container at 37.0oC ?
5. Considering the auto airbag reaction:
2NaN3 ? 2Na + 3N2
How many liters of N2 gas result when 95.0 grams of NaN3 react
at 25.0oC and 0.95 atmosphere?
6..A. An isotope of atomic number 84 and a mass number of 212 emits an alpha
particle. What are the atomic number and mass number of the product?
B. An isotope of atomic number 48 and mass number 113 emits a beta particle.
What are the atomic number and mass number of the product?
7 Well A has a concentration of 0.011 ppm(parts per million) of Pb2+ Well B contains 6.5x10-4 grams of Pb2+ in 5.00
liters Which well has the smaller concentration of Pb2+ ? Show how
Explanation / Answer
2. a) When co2 get dissolved in H2O its pH decrease as it form carbonic acid. pH of acid is less than 7.
B) WHEN solution of methyl amine is dissolved in water it form ammonium hydroxide which is basic in nature.
3. pH = - log (H+) = -log (2*10^-8) = 7.699
d) solution is basic
4. 512 g N2 = 18.28 mol
V = 12 L
T = 37 C = 310 K
P = nRT/V =3926 k Pa
5. 95 gm NaN3 = 1.46 mol
1 mol NaN3 give s 3/2 mol of N2 = 21 gm
10. O3 ---- > O2+ [O]
This nacent [O] is very reactive and hence very harmful to earth.
But O3 protect us from harmful rays of sun [UV].