PLEASE HELP ASAP DUE SOON WILL MARK BRAINLIEST

Chemistry

1 answer:

OLEGan [10]3 years ago

7 0

1 is B ca mg fe cu 2 is C

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In nature, oxygen has three common isotopes. The atomic masses and relative abundances of these isotopes are given in the table

Vaselesa [24]

Answer: The average atomic mass of oxygen is 15.999 amu

Explanation:

Mass of isotope O-16 = 15.995 amu

% abundance of isotope O-16= 99.759 % = $\frac{99.759}{100}=0.99759$

Mass of isotope O-17 = 16.995 amu

% abundance of isotope O-17 = 0.037% = $\frac{0.037}{100}=0.00037$

Mass of isotope O-18 = 17.999 amu

% abundance of isotope O-18 = 0.204% = $\frac{0.204}{100}=0.00204$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(15.995\times 0.99759)+(16.995\times 0.00037)+(17.999 \times 0.00204)]$

$A=15.999$

Thus the average atomic mass of oxygen is 15.999 amu

5 0

3 years ago

What is the symbol of the element that is classified as an alkali metal and is in period 4?

djyliett [7]

Answer:

Potassium (K) [First element in period 4]

3 0

3 years ago

Which compound can act as both a Bronsted-Lowry acid and a Bronsted-Lowry base?

Dvinal [7]

The answer is A. Water

Bronsted-Lowry base compounds are those that can accept protons

Bronsted-Lowry Acid Compounds are those that can recieve one

Water / H2O is an Amphoteric compund which mean that its molecul can act as a Base and Acid compound, so the answer is A.

5 0

3 years ago

The atoms in a chemical reaction are responsible for the (4 points)

Ira Lisetskai [31]

I think explosion because they help produce reactions

7 0

4 years ago

How much matter is in an object.

lozanna [386]

Answer:

Demands what kind of object

Explanation: