Consider two solutions, the first being 50.0 ml of 1.00 m cuso4 and the second 50.0 ml of 2.00 m koh. when the two solutions are mixed in a constant-pressure calorimeter, a precipitate forms and the temperature of the mixture rises from 21.5 ∘c to 27.7 ∘c.
a) before mixing, how many grams of cu are present in the solution of cuso4?
b) predict the identity of the precipitate in the reaction.
c) write complete equation for the reaction that occurs when the two solutions are mixed.
d) write net ionic equation for the reaction that occurs when the two solutions are mixed.
e) from the calorimetric data, calculate δh for the reaction that occurs on mixing. assume that the calorimeter absorbs only a negligible quantity of heat, that the total volume of the solution is 100.0 ml, and that the specific heat and density of the solution after mixing are the same as that of pure water.

Explanation:

Molarity of copper sulfate solution = 1.00 M

Volume of the copper sulfate solution  = 50.0 mL = 0.050 L

Moles of copper sulfate = n

n = 0.050 L × 1.00 M= 0.050 mol

1 mol of copper sulfate has 1 mol of copper . Then 0.050 mol of copper sulfate has :

of copper

a) Mass of 0.050 moles of copper = 0.050 mol × 63.5 g/mol =3.175 g

b) The identity of the compound which formed after the reaction is copper hydroxide.

c) The complete equation for the reaction that occurs when copper sulfate and potassium hydroxide are mixed:

d) ..[1]

..[2]

Common ion both sides are removed. The net ionic equation is given as:

e) Volume of solution after mixing of both solution,V= 50 mL + 50ml = 100 mL

Mass of final solution ,m= 1 mL

Density of solution ,d= 1 g/mL (same as pure water)

Heat capacity of the solution = c = 4.186 J/g°C (same as pure water)

Change in temperature of the solution,ΔT = 27.7 °C- 21.5 °C=6.2°C

Enthalpy of the reaction = ΔH =

ΔH =

The ΔH for the reaction that occurs on mixing is 51.90 kJ/mol.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.