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2 years ago

Warm air rises because of its

Chemistry

2 answers:

Nesterboy [21]2 years ago

6 0

The warm air rises because of its kinetic energy

slega [8]2 years ago

4 0

Hotter less dense then colder air as a result cold air sinks and hot air rises

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When 125 grams of FeO react with 25.0 grams of Al, how many grams of Fe can be produced? FeO + Al → Fe + Al2O3 25.9 g Fe 38.7 g

Serga [27]

Answer: The mass of iron produced will be 77.6 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For FeO:

Given mass of FeO = 125 g

Molar mass of FeO = 71.8 g/mol

Putting values in equation 1, we get:

$\text{Moles of FeO}=\frac{125g}{71.8g/mol}=1.74mol$

For aluminium:

Given mass of aluminium = 25.0 g

Molar mass of aluminium = 27 g/mol

Putting values in equation 1, we get:

$\text{Moles of aluminium}=\frac{25.0g}{27g/mol}=0.93mol$

The given chemical reaction follows:

$3FeO+2Al\rightarrow 3Fe+Al_2O_3$

By Stoichiometry of the reaction:

2 moles of aluminium metal reacts with 3 mole of FeO

So, 0.93 moles of aluminium metal will react with = $\frac{3}{2}\times 0.93=1.395mol$ of FeO

As, given amount of FeO is more than the required amount. So, it is considered as an excess reagent.

Thus, aluminium metal is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of aluminium metal produces 3 mole of iron metal

So, 0.93 moles of aluminium metal will produce = $\frac{3}{2}\times 0.93=1.395moles$ of iron metal

Now, calculating the mass of iron metal from equation 1, we get:

Molar mass of iron = 55.85 g/mol

Moles of iron = 1.395 moles

Putting values in equation 1, we get:

$1.395mol=\frac{\text{Mass of iron}}{55.85g/mol}\\\\\text{Mass of iron}=(1.395mol\times 55.85g/mol)=77.6g$

Hence, the mass of iron produced will be 77.6 grams

4 0

3 years ago

match the following items......(1. used in engines and rockets souring 2. a type of slow combustion respiration 3. a chemical ch

mezya [45]

1. Rapid combustion - used in engines and rockets souring. Large amount of energy produced.
2. Respiration - a type of slow combustion. Organic matter is transfered into energy and carbon dioxide.
3. Soaring - a chemical change. Acidification of milk into soured milk.
4. Oxidation - electron loss when combining with another element. Metals gave electrons to nonmetals and became cations.
5. Calcium - element in bone which absorbs X-rays. Calcium increases the photoelectric effect which increase absorption of X-rays.
6. Photosynthesis reaction in which the product is glucose. Plants produce glucose from carbon dioxide and water.

7 0

3 years ago

Read 2 more answers

A block has a mass of 20g and measures 2cm*4cm*2cm, will it sink or float?

stich3 [128]

It will float, because it is almost weighs like a pen.

5 0

3 years ago

If a stronger solution of sodium bicarbonate was used in beaker B, would it require more or less acetic acid to neutralize and w

Dmitriy789 [7]

Answer:

A stronger acid is needed to neutralize the reaction.

Explanation:

Neutral pH solutions are because the acid counteracts the effect of the base, and vice versa.

Both chemical products, both acid and base, reach a pH of 7, which indicates the neutrality of the solution in the reaction, that is, the solution is neither acidic nor basic but NEUTRAL.

The higher the alkalinity of the base, the greater the acidity of the acid will be needed to balance and balance the pH to give neutrality as the final product.

3 0

3 years ago

How does latitude affect climate?

Neporo4naja [7]

Answer:

The closer you are to the Equator the hotter the temperature will get, and the further you are from the Equator the colder it will get.

6 0

2 years ago