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Kobotan [32]
3 years ago
11

Doing Science plz help

Chemistry
2 answers:
tekilochka [14]3 years ago
6 0
The answer is C
Because it’s balanced you know this because of law conversion of mass.
Murljashka [212]3 years ago
4 0

Answer:

My guess is b or c but its robably wrong

Explanation:

I just also need points sorry <3

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Calculate the percentage composition of each element in calcium hydroxide
sp2606 [1]

Answer:

54.1 % Ca, 43.2 % O, 2.7% H

Explanation:

Molecular formula for calcium hydroxide is Ca(OH)₂

As we don't have a mass of Ca(OH)₂ to find out the percentage composition, we consider that the question refers to 1 mol of compound.

1 mol of hydroxide weighs 74.08 g

1 mol of hydroxide has 1 mol of Ca, therefore 40.08 g are Ca

2 moles of O therefore 32g are O

2 moles of H therefore 2 g are H

Percentage composition is known as (Mass of element/Total mass) . 100

  • (40.08 / 74.08) . 100 = 54.1 %
  • (32 / 74.08) . 100 = 43.2 %
  • (2 / 74.08) . 100 = 2.7%
6 0
3 years ago
What is needed for a wind farm to be effective
qwelly [4]

Answer:

for a effective wind farm you would need wind turbines a windy area a rotation powered generator and something to use it on

Explanation:

7 0
2 years ago
Which of this is not an effect of humans using a natural recourse?
katen-ka-za [31]

Answer:

it can allow more room for additional living things in the habitat

Explanation:

Use water for an example.

- Taking water can destroy a fish habitat.

- Using excess water can cause water to run out.

- Taking/using water leaves less amounts for others/organisms.

Taking water does not allow additional room for organisms in a habitat.

5 0
2 years ago
A Helium gas in a tube with a volume of 9.583 L under pressure of 4.972 atm at 31.8 c
andre [41]

1.905 moles of Helium gas are in the tube. Hence, option A is correct.

<h3>What is an ideal gas equation?</h3>

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Calculate the moles of the gas using the gas law,

PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.

Given data:

P= 4.972 atm

V= 9.583 L

n=?

R= 0.082057338 \;L \;atm \;K^{-1}mol^{-1}

T=31.8 +273= 304.8 K

Putting value in the given equation:

\frac{PV}{RT}=n

n= \frac{4.972 \;atm\; X \;9.583 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X 304.8}

Moles = 1.905 moles

1.905 moles of Helium gas are in the tube. Hence, option A is correct.

Learn more about the ideal gas here:

brainly.com/question/27691721

#SPJ1

3 0
2 years ago
Given the balanced equation representing a reaction occurring in an electrolytic cell:
Vikki [24]
The answer is (4) at the cathode, where reduction occurs. The Na+ gains one electron and become Na(l). So the reaction occurs at cathode and is reduction reaction.
4 0
3 years ago
Read 2 more answers
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