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Pie
3 years ago
5

What mass of carbon is present in 1.4*x10^20 molecules of sucrose?

Chemistry
1 answer:
Alenkinab [10]3 years ago
4 0

No of moles of Carbon, C = mass/ molar mass.  
 Molar mass of carbon = 12.0107. We only have to calculate the no of moles
of carbon to obtain carbon's mass. .  
 From Sucrose chemical formula C12H22O11 we know that there are 12
carbon atoms. 
 So there are 1.4x10^(20) x12 = 16.8 x 10^20 carbon atoms. 
 We will use avogardo's number to find out the number of carbon molecules
in the compound. 
 From Avogadro's no. One mole of any substance equals to 6.022140857
atoms. 
 
 So X mole contains 16.8 * 10^(20) carbon atom 
 (16.8x10^20 carbon atoms)/6.022 x10^23 particles/mol = 0.00279 mols 
 The molar mass of carbon is 12.0107g/mol so we'll multiply to get the mass:
0.00279 mols x 12 = 0.03348.
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The first excited electronic energy level of the helium atom is 3.13 x 10-18 J above the ground level. Estimate the temperature
salantis [7]

Answer:

75603.86473 K

Explanation:

Given that:

The 1st excited electronic energy level of He atom = 3.13 × 10⁻¹⁸  J

The objective of this question is to estimate the temperature at which the ratio of the population will be 5.0 between the first excited state to the ground state.

The formula for estimating the ratio of population in 1st excited state to the ground state can be computed as:

\dfrac{N_2}{N_1} = e ^{^{-\dfrac{(E_2-E_1)}{KT}}} =   e ^{^{-\dfrac{(\Delta E)}{KT}}}

From the above equation:

Δ E = energy difference =  3.13 × 10⁻¹⁸  J

k = Boltzmann constant = 1.38 × 10⁻²³  J/K

\dfrac{N_2}{N_1} = 0.5

Thus:

0.05 =e^{^{ -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}

In (0.05) = { -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}

-3.00 = { -\dfrac{3.13 \times 10^{-18} \ J}{1.38\times 10^{-23 \ J/K}\times T}}}

-3.00 = -226811.5942 \times \dfrac{1}{T}

T =  \dfrac{-226811.5942}{-3.00 }

T = 75603.86473 K

4 0
3 years ago
Which step in the process of protein synthesis occurs directly after mrna is assembled?
kondor19780726 [428]

Answer:

Translation

Explanation:

Protein synthesis is the process of production of proteins in in the cells of living organisms. Transcription and Translation are the two main steps in the protein synthesis. The first step is completed in nucleus where mRNA is made using DNA as template. The second step i.e. translation occurs in the cytoplasm with the help of Ribosomes. The mRNA synthesized during transcription is pre-mRNA. After the processing it is assembled as mature RNA. After getting assembled the second step of protein synthesis viz. Translation begins in the cytoplasm.

7 0
3 years ago
How did the mass change when the copper coin was made to look silver?
il63 [147K]

We have that The  the mass change when the copper coin was made to look silver is an increase in mass

Correct option C

It increased.

It is important to note that the copper coin after its cutting into shape will have a specific mass or weight and the silver coating solution will also have a net value of mass or weight

Therefore

The  the mass change when the copper coin was made to look silver is an increase in mass

Correct option C

It increased.

For more information on this visit

brainly.com/question/17756498?referrer=searchResults

7 0
2 years ago
How many moles of PCl5 can be produced from 22.0 g of P4 (and excess Cl2)?
scoundrel [369]
The balanced chemical reaction is written as:

P4 + 10Cl2 = 4PCl5

To determine the moles of PCl5 produced, we use the initial amount of the limiting reactant which is P4 and the relation from the reaction. We do as follows:

22.0 g P4 ( 1 mol / 123.90 g ) ( 4 mol PCl5 / 1 mol P4 ) = 0.7103 mol PCl5 produced
8 0
3 years ago
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Answer:

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