What is the relationship between the molecular mass and the molar mass of a substance?

A 5.5 sample of battery acid contains 490.0g of sulfuric acid H2SO4

prohojiy [21]

$n = \frac{m}{mw} \\ n = \frac{490}{98} \\ n = 5 \: mol$

5 0

3 years ago

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

kolbaska11 [484]

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

$1.00M=\frac{n}{0.050 L}$

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 :

$1\times 0.050 mol=0.050 mol$ 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:

$CuSO_4(aq)+2KOH (aq)\rightarrow Cu(OH)_2(s)+K_2SO_4 (aq)$

d) $CuSO_4(aq)\rightarrow Cu^{2+}(aq) +SO_{4}^{2-}(aq)$ ..[1]

$KOH (aq)\rightarrow 2K^+(aq) +OH^-(aq)$ ..[2]

$Cu^{2+}(aq) +SO_{4}^{2-}(aq)+2K^+(aq) +2OH^-(aq)\rightarrow Cu(OH)_2(s)+SO_{4}^{2-}(aq)+2K^+(aq)$

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

$Cu^{2+}(aq) +2OH^-(aq)\rightarrow Cu(OH)_2(s)(aq)$

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)

$m=d\time V=1 g/ml\times 100 mL = 100 g$

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

$Q=mc\Delta T$

$Q=100 g\times 4.186 J/g ^oC\times 6.2^oC=2595.32 J=2.595 kJ$

Enthalpy of the reaction = ΔH = $\frac{Q}{\text{Moles of copper}}$

ΔH = $\frac{2.595 kJ}{0.050 mol}=51.90 kJ/mol$

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

7 0

2 years ago

Plastic beads used in jewelry making are made of long molecules usually consisting of carbon, hydrogen, and oxygen. Compare the

bazaltina [42]

This question is requiring a comparison between the bonding in gems and plastic beads, which of course have different natures. Thus, we can conclude that bonding in gems usually ionic because they comprise metal-nonmetal compounds with large electronegativity differences, such as Al₂O₃.

On the other hand, bonding in plastics, in general, tends to be covalent because hydrogen, carbon and oxygen have way similar electronegativities.

<h3>Types of bonds:</h3><h3 />

In chemistry, the formation of chemical compounds require the appearance of forces able to held atoms together. These forces are called bonds and can be covalent, metallic or ionic depending on the bonding substances. For instance, compounds formed a nonmetal and a metal tend to be ionic, whereas substances formed by two nonmetals tend to be covalent.

In addition, the type of bond defines most of the properties the substance has, thus, ionic bonds lead to solid and molecularly well-defined crystal structures whereas covalent bonds lead to amorphous solids.

In such a way, since gems have gorgeous appearances and are way resistant to high pressures, shear and temperatures, we conclude they have ionic bonds formed between metals and nonmetals.

However, plastic, such as that in plastic beads, will have covalent bonds because it is easily deformed and it is not able to withstand high temperatures, pressures or mechanical shears.

Moreover, the nature of the bonding depends on the electronegativity, which is the tendency an atom has to attract electrons; for that reason, large electronegativity differences lead to the formation of ionic bonds (metals and nonmetals, distant in the periodic table) whereas small differences lead to covalent ones.

Learn more about bonding: brainly.com/question/792566

4 0

2 years ago

Which of the following describes how a recycling program directly benefits a community economically? The guarantee of no new lan

torisob [31]

Answer:

I guess second option i.e. More potential employment opportunities and revenue because collecting recyclable material needs manpower to collect them, and secondary employment in transport i.e. to collect all the material at one place we need transport and so on!

7 0

2 years ago

The lighter elements of Group I and II have distinctly different chemistry from their heavier congeners. For example, Be and Li

marishachu [46]

Answer:

Answer:

Explanation:

(A) Heavier members of group 1A are usually more reactive than the lighter members e.g. lithium react very slowly with liquid bromine whereas CS react violently.

Similarly Be of group 2A has smaller size, heavier member of this group show different colour in flame test but Be and Mg emit light when heated. Reactivity of group 2A metals decreases down the group

(B) In ethylene polymerization, the stronger catalytic action is shown by the alkyl of metal having less diameter e.g Be, Li etc.

A lithium alkyl in a hydrocarbon solvent is stereospecific catalyst for polymerisation of isoprene

7 0

3 years ago