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liq [111]
3 years ago
10

How many representative particles are in a 53.79 gram sample of SrCO3?

Chemistry
2 answers:
Tcecarenko [31]3 years ago
8 0
Remember representative particles/ molecules/ atoms are all the same 

<span>convert from grams -> moles </span>

<span>hope this clears thing</span>
Irina18 [472]3 years ago
5 0
To find the number of particles, you need to use Avogadro's number

6.02 x 10^23= 1 mol

As you can see, before we can convert to particles, we need moles. So let's first convert grams to moles using the molar mass (molecular weight) of the compound

molar mass of SrCO₃= 87.6 + 12.0 + (3 x 16.0)= 147.6 g/mol

53.79 g (1 mol/ 147.6 g)= 0.364 mol

now let's convert moles to particles using Avogadro's number

0.364 mol SrCO₃ (6.02x10^23/ 1 mol)= 2.19 x 10^23


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Calculate the pressure, in atmospheres, required to compress a sample of helium gas from 27.3 L (at 1.00 atm) to 3.36 L at const
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Answer:

8.125 atm

Explanation:

Hello,

Boyle's law states that at constant temperature:

P_1V_1=P_2V_2

In this case:

P_1=1 atm, V_1=27.3L, V_2=3.36L

Solving for P_2:

P_2=\frac{P_1V_1}{V_2}=\frac{1atm*27.3L}{3.36L}\\P_2=8.125atm

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3 years ago
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5 0
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Explain why lunar eclipses occur during a full moom
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The answer to you're question is:

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3 years ago
Write out the balanced equation for the following word equation. Use the proper state abbreviations for each of the reactants an
skad [1K]

Answer:

Li (s)  +   H₂O (l)  → 1/2 H₂ (g)  + LiOH (aq)

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The Balmer series consists of the spectral lines from hydrogen for an electron making a transition from an excited state to the
MaRussiya [10]

Answer:

Wavelength of the first four spectral line:

\lambda_1=1216{\AA}

\lambda_2=1026{\AA}

\lambda_3=972.8{\AA}

\lambda_4=950{\AA}

Explanation:

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to calculate wavelength of first four spectral line:

For hydrogen Z=1;

by using rydberg equation

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1. n=2 to n=1

\frac{1}{\lambda} =RZ^2[\frac{1}{n_1^2} -\frac{1}{n_2^2} ]

\frac{1}{R} =912{\AA} =rydberg constant

\lambda=\frac{4}{3R}

\lambda_1=1216{\AA}

2. n=3 to n=1

\lambda=\frac{9}{8R}

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3. n=4 to n=1

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\lambda_4=950{\AA}

5 0
3 years ago
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