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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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Calculate the number of moles in a 2.98 g sample of aluminum.
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Molar mass <span>Aluminium ( Al) = 26.98 g/mol

1 mole ------------ 26.98 g
? mole ----------- 2.98 g

moles Al = 2.98 x 1 / 26.98

moles Al = 2.98 / 26.98

= 0.110 moles

hope this helps!

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3 years ago
E is solution of HCI of unk concentration f contain 4.8g of NaOH in 25cm point of salution​
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Perform the following operationand express the answer inscientific notation.7.00x10^5 - 5.00x10^4
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Taking into account the scientific notation,  the result of the subtraction is 6.5×10⁵.

<h3>Scientific notation</h3>

First, remember that scientific notation is a quick way to represent a number using powers of base ten.

The numbers are written as a product:

a×10ⁿ

where:

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  • n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.
<h3 /><h3>Subtraction in scientific notation</h3>

You want to subtract two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found. In this case, the highest exponent is 5.

Then all the values ​​are expressed as a function of the base 10 exponent with the highest exponent. In this case: 5.00×10⁴=0.500×10⁵

Taking the quantities to the same exponent, all you have to do is subtract what was previously called the number "a". In this case:

7.00×10⁵ - 0.500×10⁵= (7.00- 0.500)×10⁵= 6.5×10⁵

Finally, the result of the subtraction is 6.5×10⁵.

Learn more about scientific notation:

brainly.com/question/11403716

brainly.com/question/853571

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