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andreev551 [17]
3 years ago
11

Balance the following reaction. A coefficient of \"1\" is understood. Choose option \"blank\" for the correct answer if the coef

ficient is \"1.\". . Al + ZnCl2 → Zn + AlCl3. . . 2.Balance the following reaction. A coefficient of \"1\" is understood. Choose option \"blank\" for the correct answer if the coefficient is \"1.\". . NH3 + O2 → N2 + H2O. .
Chemistry
1 answer:
g100num [7]3 years ago
8 0
Conservation of mass is the underlying principle of balancing equation. When we balance equation, this means that we acknowledge that before and after the chemical reaction, the elements are conserved. To balance the chemical equation, we add coefficients before each reactant and product. Here are the following answers: 

Reaction 1: 
<span>2Al
3ZnCl2
3Zn
2AlCl3
Reaction 2: 
</span><span>4NH3
3O2
2N2
6H2O</span>
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How many grams of NH3 can be produced from the reaction of 28g of N2 and 25g of H2?
Reika [66]
N2<span> + 3H</span>2<span> = 2NH</span><span>3
so, NH3 = (N2 + 3H2)/ 2
            =  (28g + 3*25g)/2
            = 51.5g</span>
4 0
3 years ago
A 15.75 g piece of iron absorbs 1097 joules of heat energy, and its temperature changes from 25°C to 177°C. Calculate the specif
vekshin1

The answer for the following problem is mentioned below.

Explanation:

Given:

mass of iron (m) = 15.75 grams

heat (q) = 1097 J

initial temperature (t_{1}) = 25°C

final temperature (t_{2}) = 177°C

To find:

specific heat (c)

We know;

 c = q ÷ mΔT

where;

c represents the specific heat

q represents the heat

m represents the mass

t represents the temperature

c = \frac{1097}{15.75 * (177-25)}

c = 0.45 J/kg°C

<u><em>Therefore the specific heat capacity of iron is 0.45 J/kg°C.</em></u>

8 0
4 years ago
If you wanna get oil to 180 celcius when it starts at 20 how many units of thermal energy is needed?
Zarrin [17]

Answer:

The thermal energy (heat) needed, to raise the temperature of oil of mass  'm' kilogram and specific heat capacity 'c' from 20°C to 180°C  is  160·m·c joules

Explanation:

The heat capacity, 'C', of a substance is the heat change, ΔQ, required by a given mass, 'm', of the substance to produce a unit temperature change, ΔT

∴ C = ΔQ/ΔT

ΔQ = C × ΔT

C = m × c

Where;

c = The specific heat capacity

ΔT = The temperature change = T₂ - T₁

∴ ΔQ = m × c × ΔT

Therefore, the thermal energy (heat) needed, ΔQ, to raise the temperature of oil of mass 'm' kilogram and specific heat capacity, 'c' from 20°C to 180°C  is given as follows;

ΔQ = m × c × (180° - 20°) = 160° × m·c

ΔQ = 160·m·c joules

7 0
3 years ago
A book is resting on a table. The book has
Sergeeva-Olga [200]

Hey there!

The correct answer should be B. Potential Energy Only

Potential energy is the energy stored in an object because it isn’t moving/isn’t in motion

Hope this helps you!

God bless ❤️

xXxGolferGirlxXx

6 0
3 years ago
Crude oil can be separated into its consistent parts based on their boiling points. What technique uses this principle?
omeli [17]
The answer is B, distillation.

(You can see more details about distillation as well as other separation techniques on the document pdf titled Lab #2 Physical Separation Techniques by ccri.edu)
6 0
3 years ago
Read 2 more answers
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