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3 years ago

A kilogram of lead has a greater _____ than a kilogram of air. mass volume density

Chemistry

2 answers:

Lostsunrise [7]3 years ago

8 0

Answer : Option D) Density.

Explanation : A kilogram of lead has greater density than a kilogram of air.

Density of lead is greater than air because lead has density $11.34 \frac{g}{cm^{3}}$ , whereas air has density of $0.001225 \frac{g}{cm^{3}}$ .

It is clear from the above values, that one kilogram of lead will be obviously denser than kilogram of air.

Afina-wow [57]3 years ago

4 0

A kilogram of lead has a higher density than a kilogram of air because of higher molecular weight of lead.

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Trichloroethylene, a widely used degreasing solvent for machine parts, is produced in a two-step reaction sequence. Ethylene is

solmaris [256]

Answer:

ΔH°C2H2Cl4(l) = -333,36 kJ/mol

ΔH°r₂ = -35,14 kJ/mol

Explanation:

The ΔH°r of the first reaction is:

ΔH°r = -385,76 kJ/mol = (ΔH°C2H2Cl4(l) + ΔH°H2(g)) - (ΔH°C2H4(g) + 2ΔHCl2 (g))

ΔH°H2(g) = 0 kJ/mol

ΔH°C2H4(g) = 52,4 kJ/mol

Δ°HCl2 (g) = 0 kJ/mol

Replacing:

ΔH°C2H2Cl4(l) = -385,76 kJ/mol + 52,4 kJ/mol = -333,36 kJ/mol

The standard heat of the second reaction is:

ΔH°r₂ = ΔH°C2HCl3(l) + ΔH°HCl(g) - ΔH°C2H2Cl4(l)

Where:

ΔH°C2HCl3(l) = -276,2 kJ/mol; ΔH°HCl(g) = -92,3 kJ/mol; ΔH°C2H2Cl4(l) = -333,36 kJ/mol

Replacing:

ΔH°r₂ = -276,2 kJ/mol -92,3 kJ/mol + 333,36 kJ/mol

ΔH°r₂ = -35,14 kJ/mol

I hope it helps!

4 0

3 years ago

Noble gas compounds like KrF, XeCl, and XeBr are used in excimer lasers. Draw an approximate molecular orbital diagram appropria

Aneli [31]

Answer:

Here's what I get.

Explanation:

The MO diagrams of KrBr, XeCl, and XeBr are shown below.

They are similar, except for the numbering of the valence shell orbitals.

Also, I have drawn the s and p orbitals at the same energy levels for both atoms in the compounds. That is obviously not the case.

However, the MO diagrams are approximately correct.

The ground state electron configuration of KrF is

$(1\sigma_{g})^{2}\, (1\sigma_{u}^{*})^{2} \, (2\sigma_{g})^{2} \, (2\sigma_{u}^{*})^{2} \, (3\sigma_{g})^{2} \, (1\pi_{u})^{4} \, (1\pi_{g}^{*})^{4} \, (3\sigma_{g}^{*})^{1}$

KrF⁺ will have one less electron than KrF.

You remove the antibonding electron from the highest energy orbital, so the bond order increases.

The KrF bond will be stronger.

6 0

4 years ago

True or False: Adding 4.18 joules to water will increase the temperature more than adding 1 calorie to water.

mote1985 [20]

Answer:

Because one calorie is equal to 4.18 J, it takes 4.18 J to raise the temperature of one gram of water by 1°C. In joules, water's specific heat is 4.18 J per gram per °C. If you look at the specific heat graph shown below, you will see that 4.18 is an unusually large value.

6 0

3 years ago

A rectangular solid measures 1.0m by 5.6cm by 2.1mm express its volume in cubic meters

Lemur [1.5K]

First, make sure all three measurements have the same unit (I recommend meters because that's what the question calls for)

1.0m=1.0m
5.6cm=0.056m
2.1mm=0.0021m

Then, you just want to multiply the three together to get the total volume.
1.0X0.056X0.0021=0.0001176 or 0.00012, if your teacher wants you to use proper sig figs

6 0

4 years ago

Read 2 more answers

What is the concentration of each ion present in a saturated aqueous solution of the compound BaSO4. Ksp = 1.1 x 10^-10

wel

Answer:

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7 0

3 years ago