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konstantin123 [22]
3 years ago
7

Oh no... not again... Prof. Vitarelli spots Sybil running down the hall... yelling something... something about her tea cups...

Prof. Vitarelli and Prof. Snape try to hold her back. But they fail. She yells, I’ve learned another exam question from last year! Zinc metal reacts with hydrochloric acid to produce hydrogen gas and an aqueous solution of zinc(II) chloride. What is the reducing agent in this reaction? Maybe Prof. Umbridge was right in trying to remove her.
Chemistry
1 answer:
Y_Kistochka [10]3 years ago
6 0

Answer:

The reducing agent is Zn.

Explanation:

Let's consider the reaction between zinc and hydrochloric acid.

Zn(s) + 2 HCl(aq) ⇄ ZnCl₂(aq) + H₂(g)

This is a redox reaction, which can be divided in 2 half-reactions: reduction and oxidation.

In the reduction, H⁺ gains electrons and it is considered the oxidizing agent.

2H⁺ + 2 e⁻ ⇒ H₂

In the oxidation, Zn loses electrons and it is considered the reducing agent.

Zn ⇒ Zn²⁺ + 2 e⁻

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Given that the molar mass of H2O is 18.02 g/mol, how many liters of propane are required at STP to produce 75 g of H2O from this
alukav5142 [94]
First, we require the combustion equation of propane:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

We see that each mole of propane produces 4 moles of water.
Now, we calculate the moles of water required: 75 / 18.02
Moles required = 4.16
Moles of propane required for this are: 4.16 / 4 = 1.04 moles

Each mole of gas occupies 22.14 liters, so the volume of propane required are 1.04 * 22.14 = 23.03 L
23 L of propane are required
4 0
3 years ago
A eraser has a mass of 4g and a volume of 2cm3 what is it’s density
sladkih [1.3K]

Answer:

<h3>The answer is 2.0 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

From the question

mass = 4 g

volume = 2 cm³

We have

density =  \frac{4}{2}  \\

We have the final answer as

<h3>2.0 g/cm³</h3>

Hope this helps you

4 0
3 years ago
Balance the following equation:<br> B203(s) + HF(l) =&gt; BF3(g) + H20(l)
Kazeer [188]

20 B203(s) + 12180 HF(l) = 4060 BF3(g) + 609 H20(l)

7 0
3 years ago
Which of the following is not a step in the conversion of 37 L to dam3?
MArishka [77]
The first one. observe that numerator and denominator are of same type in all other cases. but in 1st one, its length/volume which is crazy. how can one equate length to volume ? no way.
3 0
3 years ago
How many gallons of concentrated sulfuric acid (density of 1.84 g/cm3) are required to have a mass of 184.33 pounds?
KengaRu [80]

After series of conversion from one unit to another, the number of gallons was found to be 12 litres

<h3>Density, Mass and Volume</h3>

Given Data

  • Density of Sulfuric acid = 1.84 g/cm3
  • Mass of Sulfuric acid = 184.33 Pounds

Conversion from pounds to Gram

1 kg ---------2.204 lb

x kg ---------184.33 lb

x = 184.33/2.204

x = 83.634 kg

hence the mass in gram = 83.634*1000

mass in gram = 83634 g

Now let us find the volume

We know that density = mass/volume

volume = mass/density

volume = 83634/1.84

volume = 45453.26 cm^3

Convert cm^3 to litres

Volume in litres = 45453.26 /1000

Volume in litres = 45.45 Litres

Convert from Litres to Gallons

1 gallon = 3.79 L

x gallons =  45.45 L

x =  45.45/3.79

x gallons = 11.99 L


Approx = 12 Litres

Learn more about density here:

brainly.com/question/1354972

7 0
3 years ago
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