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VladimirAG [237]
3 years ago
10

Help e please i give brainlist

Chemistry
2 answers:
VashaNatasha [74]3 years ago
7 0

Answer:

c

Explanation:

crimeas [40]3 years ago
4 0
The answer most be c
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The molar heats of fusion and sublimation of lead are 4.77 and 182.8 kj/mol, respectively. estimate the molar heat of vaporizati
Yakvenalex [24]

Answer:The molar heat of vaporization of molten lead is 178.03 kJ/mol.

Explanation:

The molar heats of fusion of lead

Pb(l)\rightarrow Pb(s),\Delta H_f=-4.77 kJ/mol...(1)

The molar heats of sublimation of lead

Pb(s)\rightarrow Pb(g),\Delta H_s=182.8 kJ/mol...(2)

Adding (1) and (2)

Pb(l)\rightarrow Pb(g),\Delta H_v=?

\Delta H_v=\Delta H_f+\Delta H_s=(-4.77) kJ/mol+182.8 kJ/mol=178.03 kJ/mol

The molar heat of vaporization of molten lead is 178.03 kJ/mol.

6 0
3 years ago
Read 2 more answers
What mass of iron is formed when 240 g of iron(III) oxide reacts completely with carbon monoxide?
son4ous [18]

Answer:

168 g

Reaction:

Fe_{2}O_{3} + 3 CO >>> 2 Fe + 3CO_{2}

Explanation:

First we need to figure out what is the formula mass (Mr) of Fe2O3 (Iron(III) oxide).

The atomic mass of Fe=56, O=16

Mr= 56+56+16+16+16=160 g/mol

We can now figure out the moles of the iron:

240/160 = 1.5 mol

Then we need to find the ratio to make Fe.

In the reaction, we know that 1 mole of Fe2O3 can make 2 moles of Fe. So 1.5 moles of Fe2O3 can make 3 moles of Fe.

And then we need to find the mass of the Fe.

3×56=168 g.

Hence 168g of the iron is made after the reaction.

5 0
3 years ago
C). If 0.5 mole of oxygen (,) reacted with hydrogen (H2), how many mole of water (H20) was produced
son4ous [18]

Answer:

1 mol of water is produced in those conditions.

Explanation:

The reaction to produce water between H₂ and O₂ is this:

2H₂  +  O₂  →  2H₂O

We don't have the amount of hydrogen, so we have to think that is in excess.

Let's work with oxygen.

Ratio is 1:2

For 0.5 mole of oxygen, I will make the double of moles of water.

4 0
3 years ago
Read 2 more answers
Use the following terms to fill in the blanks:
Alenkinab [10]

Answer:

1. Molality.

2. Concentration.

3. Percent by mass.

4.  Mole fraction.

Explanation:

Molarity is the measurement by which the number of moles is measured by a solute. The solution here is one liter respectively.

Concentration is the product which is emerged when the amount of the solute is divided by the amount o the solvent or solution.

Mole fraction refers to the number of component moles divided by the number of the solution moles.

7 0
3 years ago
What is the final pH of a solution obtained by mixing 300 ml of 0.4 M NH3 with 175 ml of 0.3 M HCl? (Kb = 1.8 x 10-5) Show all o
MariettaO [177]

Answer:

pH of the final solution = 9.15

Explanation:

Equation of the reaction: HCl + NH₃ ----> NH₄Cl

Number of moles of  NH₃ = molarity * volume (L)

= 0.4 M * (300/1000) * 1 L =  0.12 moles

Number of moles of HCl =  molarity * volume (L)

= 0.3 M * (175/1000) * 1 L = 0.0525 moles

Since all he acid is used up in the reaction, number of moles of acid used up equals number of moles of NH₄Cl produced

Number moles of NH₄Cl produced =  0.0525 moles

Number of moles of base left unreacted =  0.12 - 0.0525 = 0.0675

pOH = pKb + log([salt]/[base])

pKb = -logKb

pOH = -log (1.8 * 10⁻⁵) + log (0.0525/0.06755)

pOh = 4.744 + 0.109

pOH = 4.853

pH = 14 - pOH

pH = 14 - 4.853

pH = 9.15

Therefore, pH of the final solution = 9.15

3 0
3 years ago
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