Many times, during a chemical reaction, energy is given off. this type of chemical reaction can be termed

Are metallic bonds are found in compounds

Ratling [72]

Answer:

Explanation:

Yes :)

Mark brainliest please

5 0

3 years ago

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COLLEGE CHEMISTRY 35 POINTS

Sati [7]

6.81% is the percent yield when 12 g of CO2 are formed experimentally from the reaction of 0.5 moles of C8H18 reacting with excess oxygen.

Explanation:

Data given:

mass of carbon dioxide formed = 12 grams (actual yield)

atomic mass of CO2 = 44.01 grams/mole

moles of $C_{8} H_{18}$ = 0.5

Balanced chemical reaction:

2 $C_{8} H_{18}$ + 25 $O_{2}$ ⇒ 16 C $O_{2}$ + 18 $H_{2} _O{}$

number of moles of carbon dioxide given is

number of moles = $\frac{mass}{atomic mass of 1 mole}$

number of moles= $\frac{12}{44}$

number of moles of carbon dioxide gas = 0.27 moles

from the reaction 2 moles of $C_{8} H_{18}$ reacts to produce 16 moles of C $O_{2}$

So, when 0.5 moles reacted it produces x moles

$\frac{16}{2}$ = $\frac{x}{0.5}$

x = 4

4 moles of carbon dioxide formed, mass from it will give theoretical yield.

mass = number of moles x molar mass

mass = 4 x 44.01

= 176.04 grams

percent yield = $\frac{actual yield}{theoretical yield}$ x 100

percent yield = $\frac{12}{176.04}$ x 100

percent yield = 6.81 %

8 0

3 years ago

The mass of an object is 240g and its volume is 60 cm3<br> A. Sink<br> B. Float

Vinil7 [7]

Answer:

A Sink

Explanation:

Anything greater than 1g/cm3 will sink in water

4 0

4 years ago

Please help! Consider the following reaction: 3H2S (g) + 3O2 (g)  2 SO2 (g) + 2H2O (g) If O2 was the excess reagent, 4.15 mol o

iren [92.7K]

Answer:

91.8 %

Explanation:

Data given:

Amount of H₂S = 4.15 mol

Amount of water (H₂O) = 68.55 g

Amount of oxygen O₂ = in excess

Percent yield of reaction water (H₂O) of water = ?

Reaction Given:

2H₂S (g) + 3O₂ (g) ----------> 2SO₂ (g) + 2H₂O (g)

Solution:

First we look for the theoretical yield by looking in the reaction

2H₂S (g) + 3O₂ (g) ----------> 2SO₂ (g) + 2H₂O (g)

As oxygen is in the excess so only H₂S amount act as limiting reagent.

2H₂S (g) + 3O₂ (g) ----------> 2SO₂ (g) + 2H₂O (g)

2 mol 2 mol

to convert amount of H₂O from moles to grams

mass in grams = no. of moles x molar mass

Molar Mass of H₂O = 2(1) + 16 = 18 g/mol

Put values in above equation

mass in grams = 2 mol x 18 g/mol

mass in grams = 36 g

So,

3H₂S (g) + 3O₂ (g) ----------> 2SO₂ (g) + 2H₂O (g)

2 mol 36 g

As from the reaction it is clear that 2 mole of H₂S gives 36g H₂O then 4.15 mole will give how many grams of water

Apply unity formula

2 mol of H₂S ≅ 36 g of H₂O

4.15 mol of H₂S ≅ X g of H₂O

Do cross multiplication

X g of H₂O = 36 g x 4.15 mol / 2 mol

X g of H₂O = 74.7 g

So theoretical yield = 74.7 g of H₂O

Formula used for percent yield

percent yield = actual yield / theoretical yield x 100

Put values in above equation

percent yield = 68.55 g / 74.7 g x 100

percent yield = 91.8 %

***Note

For SO₂ it is important to have actual yield. and implement same work.

6 0

4 years ago

How are forces measured and modeled?

Elodia [21]

Answer:

In physics, force is a push or pull on an object. A force can cause an object to accelerate, slow down, remain in place, or change shape. The unit of measure for force is the newton which is abbreviated as "N". One newton is the force needed to accelerate one gram of mass by one centimeter per second squared.

Explanation:

8 0

3 years ago

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