# Chemistry

posted by .

2Na + 2H2O------> 2NaOH + H2 H=-386kJ
If 5g of sodium is added to 200g of water in an open container:
(A) How much heat is absorbed/released int he reaction?

(B)What volume in formed at 22C and 102kPa?

(C) If boiling point elevation constant is 0.52K molal what is the boiling point?

• Chemistry -

a. Na is the limiting reagent. You should verify that.
mols Na = 5/23 = about 0.22 but that's an estimate.
[386 kJ/(2*23g)] x 5 = kJ heat released.

b. 5 g Na = about 0.22 mols Na and that will produce 0.22/2 = about 0.11 mols H2. Use PV = nRT to solve for V in L. If you want to use 102 kPa as P then R = 8.314

c. About 0.22 mols Na will produce about 0.22 mols NaOH and m = mols/kg solvent = about 0.22/0.200 = ?.
delta T = i*Kb*m
i for NaOH = 2
detla T = 2*0.52*m

## Similar Questions

1. ### Chemistry

How much heat (in kilojoules) is evolved or absorbed in the reaction of 2.65 g of Na with H2O?
2. ### Chemistry

A 5.80 g sample of SiH4 and an excess of oxygen were placed in a reaction container surrounded by 3.40 kg of water. The initial temperature of the water was 14.10°C. At the end of the reaction, the temperature of the water was 48.90°C. …
3. ### Chemistry

Solid sodium reacts violently with water, producing Heath hydrogen gas, and sodium hydroxide ( 2Na + 2H2O --> 2NaOH + 2H2 ). How many molecules of hydrogen gas are formed when 67.2 g of sodium are added to water?
4. ### Chemistry

1.00 g of sodium is added to a large excess of water under conditions of constant pressure (1.00 atm) and constant temperature (25 °C ). The following reaction occurs: 2Na (s) +2H2O (l)------> 2NaOH (aq) +H2(g) Delta H°rxn =-369 …
5. ### Chemistry

solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. how many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water?
6. ### Chemistry

If you add 4.6 g of sodium to water, how many molecules of H2 will be formed?
7. ### chemistry

How much heat in kilocalories is absorbed in the reaction of 1.94g of Na with H2O?
8. ### chemistry

Determine how much heat (in kilojoules) is evolved or absorbed in the reaction of 1.05 g of Na with H2O: 2Na(s)+2H2O(l) →2NaOH(aq)+H2(g),ΔH∘=−368.4 kJ
9. ### chemistry

How much heat (in kilocalories) is evolved or absorbed in the reaction of 1.60 g of Na with H2O?
10. ### Chemistry

solid sodium reacts violently with water producing heat, hydrogen gas and sodium hydroxide. How many molecules of hydrogen gas are produced when 65.4g of sodium are added to water?

More Similar Questions