All categories

3 years ago

Could anyone give me the answer to this plz 20 points

Chemistry

1 answer:

svetoff [14.1K]3 years ago

6 0

13 - Periodic table
14 - Dimitri mandeleev
15 - groups

Mark me brainiest pls it right answer

You might be interested in

CaO + H2O -> Ca(OH)2

yawa3891 [41]

The % yield of Ca(OH)₂ : 62.98%

<h3>Further eplanation </h3>

Percent yield is the compare of the amount of product obtained from a reaction with the amount you calculated

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients

Reaction

CaO + H₂O ⇒ Ca(OH)₂

mass CaO= 4.2 g

mol CaO(MW=56,0774 g/mol) :

$\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{4.2}{56,0774 g/mol}\\\\mol=0.075$

mol Ca(OH)₂ based on mol CaO

mol ratio CaO : Ca(OH)₂,= 1 : 1, so mol Ca(OH)₂ = 0.075

mass Ca(OH)₂(MW=74,093 g/mol) ⇒ theoretical

$\tt mass=mol\times MW\\\\mass=0.075\times 74,093 g/mol\\\\mass=5.557~g$

% yield :

$\tt =\dfrac{actual}{theoretical}\times 100\%\\\\=\dfrac{3.5}{5.557}\times 100\%\\\\=62.98\%$

8 0

2 years ago

How are freezing and condensation alike?

bija089 [108]

Answer:

A. Both describe ways a solid can change.

6 0

3 years ago

Hypothesis of 6. You decide to clean your bedroom. You notice that your floor is covered with clothes.

ZanzabumX [31]

Answer: So you could for example say, “IF I through my clothes into the closet. THEN the floor will be visible” I capatlized if and then because you need them in a hypothesis.

Explanation:

6 0

3 years ago

The Thermite reaction reacts iron (III) oxide, Fe2O3 with aluminium powder, Al, to form aluminium oxide, Al2O3 and iron, Fe. Fe2

Rama09 [41]

So, I don't know the answer for b but I think I found the answer for a.

I sincerely hope this isn't wrong

3 0

3 years ago

A mixture of reactants and products for the reaction shown below is at equilibrium in a 5.0 L container what would most likely h

Solnce55 [7]

Since the volume decreased, it means that the pressure is going to rise. Thus, the equilibrium of the reaction will shift in the direction that has the least amount of moles.

5 0

3 years ago