3 years ago

I found the answer but dont know how to post it

2 answers:

7 0

Click on answer at the bottom of a qn and you will see this. You can upload pics at bottom left corner by clicking on the icons and last icon is to record voice.

Or you can just type directly

umka21 [38]3 years ago

4 0

Just press on the green button down on the right

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Given: N2 + 3Cl2 → 2NCl3, ΔH = 464 kJ/mol Use the given bond energies and the periodic table to calculate the energy change in t

guapka [62]

The given chemical reaction is:

$N_{2}+3Cl_{2}-->2NCl_{3}$

Δ $H^{0}_{reaction}=$ ∑BE(reactants)-∑BE(products)

= {(941 kJ/mol) + (3 * 242 kJ/mol)} -[{2*(3*200 kJ/mol)}]

= 467 kJ/mol

Calculating the change in heat when 85.3 g chlorine reacts in the above reaction:

Moles of chlorine = $85.3 g Cl_{2}* \frac{1 mol Cl_{2}} {70.91 g Cl_{2} }$

= 1.20 mol $Cl_{2}$

Heat change when 1.20 mol chlorine reacts

= $1.20 mol * \frac{467kJ}{mol} =560.4 kJ$

6 0

3 years ago

What is the wavelength in meters of a proton (mass = 1.673 x 10-24 g) that has been accelerated to 5% of the speed of light?

Molodets [167]

Explanation:

since it has been accelerated to 5℅ of the sleec of light then

v= 5/100 × (3× 10^8)

after getting velocity you'll substitute the values in the formula

de Broglie wavelength= h/mv

don't forget to change the grams in mass to kg

aorry I don't hav my calc with me

4 0

3 years ago

Pure substances contain only one type of a. Atoms only. B. Molecules only. C. Atoms or molecules. D. Mixture.

Nesterboy [21]

A. Atoms only. An element cannot be separated into simpler materials

3 0

3 years ago

Read 2 more answers

Energy removal is illustrated in. A. Changing water ice to waterB. Changing water to steamC. Boiling of gasolineD. Evaporation o

Kryger [21]

Answer:

D. Evaporation of sea water

Explanation:

6 0

2 years ago

Sodium bicarbonate (NaHCO3) is commercially known as baking soda. How many grams and atoms of oxygen are there in 15 grams of so

ella [17]

Answer:

3 atoms of O

8.57g

Explanation:

The problem here is to find the mass of oxygen in the compound and the number of atoms of oxygen.

The formula of the compound is:

NaHCO₃;

Here we have:

1 atom of Na

1 atom of H

1 atom of C

3 atoms of O

So there are 3 atoms of O

To find the mass of oxygen , we use the molar mass of oxygen;

Molar mass of oxygen = 16g/mol

Mass of oxygen = $\frac{3(16)}{84.01}$ x 15 = 8.57g

4 0

3 years ago