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lions [1.4K]
4 years ago
9

If a molecule demonstrates paramagnetism, then : I. The substance can have both paired and unpaired electrons. II. The bond orde

r is not a whole number. III. It can be determined by drawing a Lewis structure. IV. It must be an ion.
Chemistry
1 answer:
jolli1 [7]4 years ago
8 0

Answer:The bond order is not a whole number.

Explanation:

If a molecule is paramagnetic, then there are unpaired electrons in some of its molecular orbitals. This will cause the bond order not to be a whole number when treated by applying the ordinary molecular orbital theory to the molecule.

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What amount of heat (in kJ) is required to convert 19.8 g of an unknown liquid (MM = 83.21 g/mol) at 19.2 °C to a gas at 93.5 °C
Vitek1552 [10]

The total energy required to convert the unknown liquid to gas at the given temperature is 7.215 kJ.

The given parameters;

  • <em>mass of the unknown liquid, m = 19.8 g</em>
  • <em>molar mass of liquid = 83.21 g/mol</em>
  • <em>initial temperature of the liquid, = 19.2 °C</em>
  • <em>boiling point temperature of the liquid, = 57.3°C</em>
  • <em>final temperature of the liquid = 93.5 °C</em>

The total heat required to convert the liquid to gas is calculated as follows;

<em>H = Heat to raise to boiling temp. + Heat to vaporize the liquid + Heat of gas vapor</em>

The heat required to raise the temperature of the liquid to boiling point;

H_1 = mc\Delta t\\\\H_1 = 19.8 \times 1.58 \times (57.3 - 19.2)\\\\H_1 = 1,191.92 \ J\\\\H_1 = 1.1919 \ kJ

The number of moles of the liquid is calculated as;

moles= \frac{19.8 \ g}{83.21 \ g/mol} = 0.238 \ mol

The heat required to vaporize the liquid;

H_2 = n H_{vap}\\\\H _2 = 0.238 \times 22.5\\\\H_2 = 5.355\ kJ

The heat of the gas vapor is calculated as;

H_3 = mc_g \Delta t\\\\H_3 = 19.8 \times 0.932 \times (93.5- 57.3)\\\\H_3 = 668.02 \ J\\\\H_3 = 0.668 \ kJ

The total energy required to convert the unknown liquid to gas at the given temperature is calculated as;

H_{total} = 1.1919 \ kJ \ + \ 5.355 \ kJ \ + \ 0.668 \ kJ\\\\H_{total} = 7.215 \ kJ

Thus, the total energy required to convert the unknown liquid to gas at the given temperature is 7.215 kJ.

learn more here:brainly.com/question/13944094

6 0
3 years ago
a chemical company has decided to store some spare iron sulfate in aluminium tanks. explain why this is a bad idea
ella [17]

Answer:

It will oxidize, corrode, and leak out.

Explanation:

4 0
2 years ago
When aqueous solutions of K3PO4 and Ba(NO3)2 are combined, Ba3(PO4)2 precipitates. Calculate the mass, in grams, of the Ba3(PO4)
Firdavs [7]

Answer:

Mass of Ba₃(PO₄)₂ = 0.0361 g

Explanation:

Given data:

Volume of Ba(NO₃)₂ = 1.2 mL (1.2 × 10⁻³ L )

Molarity of Ba(NO₃)₂ = 0.152 M

Volume of K₃PO₄ = 4.2 mL (4.2 × 10⁻³ L)

Molarity of K₃PO₄ =  0.604 M

Mass of Ba₃(PO₄)₂ produced = ?

Solution:

Chemical equation:

3Ba(NO₃)₂  + 2K₃PO₄  → Ba₃(PO₄)₂  + 6KNO₃

Number of moles of Ba(NO₃)₂ = Molarity × Volume in litter

Number of moles of Ba(NO₃)₂ = 0.152 M × 1.2 × 10⁻³ L

Number of moles of Ba(NO₃)₂ = 0.182 × 10⁻³ mol

Number of moles of K₃PO₄ = Molarity × Volume in litter

Number of moles of K₃PO₄ = 0.604 M × 4.2 × 10⁻³ L

Number of moles of K₃PO₄ = 2.537 × 10⁻³ mol

Now we will compare the moles of Ba₃(PO₄)₂ with K₃PO₄ and Ba(NO₃)₂ .

              Ba(NO₃)₂        :         Ba₃(PO₄)₂

                   3                :               1

              0.182 × 10⁻³    :              1/3 ×0.182 × 10⁻³ = 0.060 × 10⁻³ mol

                K₃PO₄           :          Ba₃(PO₄)₂

                   2                 :                1

              2.537 × 10⁻³     :               1/2 ×  2.537 × 10⁻³= 1.269 × 10⁻³ mol

The number of moles of Ba₃(PO₄)₂ produced by  Ba(NO₃)₂  are less it will limiting reactant.

Mass of Ba₃(PO₄)₂ = moles × molar mass

Mass of Ba₃(PO₄)₂ = 0.060 × 10⁻³ mol × 601.93 g/mol

Mass of Ba₃(PO₄)₂ = 36.12 × 10⁻³ g

Mass of Ba₃(PO₄)₂ = 0.0361 g

6 0
4 years ago
Calculate the volume of 12.0 g of helium at 100° C and 1.2 atm.
satela [25.4K]

Answer:

the answer I think is 76.5L

7 0
3 years ago
PLEASE HELP ME
Andru [333]

Answer:

P4O10 + 6H2O → 4H3PO4

so 1,6,4

7 0
3 years ago
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