Chemistry

posted by .

Sodium metal dissolves in liquid mercury to form a solution called a sodium amalgam. The densities of Na(s) and Hg(l) are 0.97 g/cm3 and 13.6 g/cm3, respectively. A sodium amalgam is made by dissolving 1.0 cm3 Na(s) in 20.0 cm3 Hg(l). Assume that the final volume of the solution is 21.0cm3. (a) calculate the molality of Na in the solution. (b) calculate the molarity of Na in the solution. (c) for dilute aqueous solutions, the molality and molarity are generally nearly equal in value. Is that the case for sodium amalgam described here?

• Chemistry -

determine the final concentration of a 20.ml 5.M NaCl solution if 30Mml of water has is added to the solution?

• Chemistry---to pk -

Please don't muddle up the board with duplicate questions ESPECIALLY piggy backing on another. Go to the top of the page and post your own question. You'll get faster service that way.

• Chemistry--to bernan -

Find grams Na and grams Hg.
g Na = 0.97 g/cc x 1 cc = 0.97g
g Hg = 13.6 g/cc x 20 cc = about 270 g (all of this is about. You should redo the math on your calculator. It will be better than my estimates.)
molality = moles Na/kg solvent.
moles Na = g Na/molar mass Na.
kg solvent = 0.270
Substitute and solve for m.

For molarity. M = moles/L soln
moles Na you calculated above.
L soln = 21 cc = 0.021 L.
Substitute into M = moles/L and calculate.

The c part you can answer after you've completed a and b parts.
Post your work if you get stuck.

Similar Questions

1. Chemistry

The density of mercury is 13.54 g/cm3. Suppose you need 40 gm of mercury for an experiment. What volume of mercury do you need?
2. Chemistry

I need help classifying these as physical and chemical properties! 1. sodium metal in chlorine gas releases luster. 2. sodium metal has a metallic silver luster. 3. sodium metal in water porduces hydrogen gas. 4. sodium metal melts …
3. college

sodium metal dissolves in liquid mercury to form a solution called a sodium amalgam. the densities of Na(s) and Hg(l) are 0.97g/mL and 13.6g/mL. a sodium amalgam is made by dissolving 1.0 mL Na(s) in 20.0 mL Hg(l). the final volume …
4. Chmistry

Sodium metal dissolves in liquid mercury to form a solution called a sodium amalgam. The densities of Na(s) and Hg(l) are 0.97 g/cm3 and 13.6 g/cm3, respectively. A sodium amalgam is made by dissolving 1.0 cm3 Na(s) in 20.0 cm3 Hg(l). …
5. chemistry

when chlorine gas is bubbled into a solution of sodium bromide, the sodium bromide reacts to give bromine a red brown liquid and sodium chlorine. A solution was made by dissolving 20.0g of sodium bromide in 100.0 g of water. After …
6. chemistry

when chlorine gas is bubbled into a solution of sodium bromide, the sodium bromide reacts to give bromine a red brown liquid and sodium chlorine. A solution was made by dissolving 20.0g of sodium bromide in 100.0 g of water. After …
7. Chemistry

We had a lab where the standard solution was potassium hdrogenphthalate. In this we added 3 drops of phenolphtalein indicator and then we ran sodium hydroxide into the solution. We did four different flasks and the final readings for …
8. chemistry

sodium metal dissolves im liquid mercury to form of NA(s) and Hg(l) are 0.97 g/ml and 13.6 g/ml respectively. a sodium amalgoum is made by dissolving 10 ml Na (s) in 20.0 ml Hg (l). The final volume of solution is 21.0 ml. Calculate …
9. Chemistry

A chemist reacted 0.05 moles of solid sodium with water to form 50 cm3 of sodium hydroxide solution what mass of sodium was reacted?
10. chemistry

3. A solution is made by dissolving 5.00 g of impure sodium hydroxide in water and making it up to 1.00dm3 of solution. 25.0 cm3 of this solution is neutralized by 30.0 cm3 of hydrochloric acid of concentration 0.102 mol/dm3. a) Calculate …

More Similar Questions