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3 years ago

In a double bond, two atoms share a total of _____ electrons. a two b three c four d six

Chemistry

1 answer:

MissTica3 years ago

3 0

Answer:

C: 4

Explanation:

In every single covalent bond, each atom shares one electron. 1 + 1 = 2. A double bond is just two bonds so, 2 x 2 = 4.

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What is the freezing point of a solution prepared from 45.0 g ethylene glycol (C2H6O2) and 85.0 g H2O? Kf of water is 1.86°C/m.

Andrews [41]

Answer:

$T_{sol}=-15.9\°C$

Explanation:

Hello,

In this case, we can analyze the colligative property of solutions - freezing point depression - for the formed solution when ethylene glycol mixes with water. Thus, since water freezes at 0 °C, we can compute the freezing point of the solution as shown below:

$T_{sol}=T_{water}-i*m*Kf$

Whereas the van't Hoff factor for this solute is 1 as it is nonionizing and the molality is:

$m=\frac{mol_{solute}}{kg\ of\ water}=\frac{45.0g*\frac{1mol}{62g} }{85.0g*\frac{1kg}{1000g} } =8.54m$

Thus, we obtain:

$T_{sol}=0\°C+(-8.54m*1.86\frac{\°C}{m} )\\\\T_{sol}=-15.9\°C$

Best regards.

6 0

3 years ago

Please help !!!

stiv31 [10]

Answer:

2KClO3 》》2KCl +3O2

C+ O2》》CO2

number of C moles

Required O2 moles (According to the mole ratio )

Relevant to the first equation, find the moles the KClO3, which is used to produce that amount of O2 moles

Now you can find the mass of KClO3

I mentioned the useful steps which can guide you to get the answer.

Explanation:

5 0

3 years ago

What is the unbalanced equation of rust? (Not the balanced equation)

Bond [772]

Answer:

4Fe+ 3O2 → 2Fe2O

Explanation:

Let's return to the chemical reaction in which iron (Fe) combines with oxygen (O2) to form rust, or iron oxide (Fe2O3). The equation for this reaction is: 4Fe+ 3O2 → 2Fe2O

6 0

3 years ago

Read 2 more answers

A certain reaction has an activation energy of 67.0 kJ/mol and a frequency factor of A1 = 4.20×1012. What is the rate constant,

MrRa [10]

Answer:

K = 7.00

Explanation:

<u>1) Arrhenius equation</u>

Arrhenius equation shows the relation between activation energy, temperature, and the equilibrium constant.

This is the equation:

$K=Ae^{-Ea/RT}$

Where:

K is the equilibrium constant,
A is the frequency factor,
Ea is the activation energy (in J/mol),
T is the temperature in kelvins (K), and
R is the universal constant.

<u></u>

<u>2) Substitute, using the right units, and compute:</u>

A = 4.20 × 10¹² (dimensionless)
Ea = 67.0 kJ/mol = 67,000 J/mol
T = 24.0°C = 24.0 + 273.15 K = 297.15 K
R = 8.314 J/K mol

$K=Ae^{-Ea/RT}=(4.20)(10)^{12}e^{-67,000J/mol/(8.314J/molK.297.15K)}$

K = 7.00

5 0

3 years ago

A chemist is studying small organic compounds for their potential use as an antifreeze. When 0.243 g of a compound is dissolved

harina [27]

Molar mass = 144.2 g/mol.

<h3>Calculate Molar mass.</h3>

Formula to solve this: ΔT = Kf . m

ΔT → Freezing point of pure solvent - Freezing point of solution

0°C - (-1.94°C) = 1.86 °C/m . m

1.94°C / 1.86 m/°C = m → 1.04 m

1.04 are the moles of solute in 1kg of solvent → molality (mol/kg)

Let's convert the mass of our solvent in kg to determine the moles.

80 g . 1kg / 1000 g = 0.08 kg

Molality . kg of solvent → Solute moles

1.04 mol/kg . 0.080 kg = 0.0832 moles

These are the moles of 12 g of solute. To find the molar mass → g/mol

12 g / 0.0832 mol = 144.2 g/mol

To learn more about Molar mass from the given link:

brainly.com/question/14787860

#SPJ4

4 0

1 year ago