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anyanavicka [17]
2 years ago
12

What is the difference between mass number and atomic mass (sometimes also called atomic weight)? Boron has an atomic mass of 10

.811. What does this mean?
Chemistry
1 answer:
RUDIKE [14]2 years ago
3 0

Answer:

<h3> I think....atomic mass: it is the average of total masses of isotopes in the element..... mass no: it is the total no.of protons and neutrons in atomic nuclei of abundant isotope in the element</h3>

Explanation:

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What is the percent by mass of Fluorine in Nitrogen triflouride NF3?
Kipish [7]

Answer:

The answer to your question is 80.3%

Explanation:

Data

Percent by mass of F

molecules NF₃

Process

1.- Calculate the molar mass of nitrogen trifluoride

molar mass = (1 x 14) + (19 x 3)

                    = 14 + 57

                    = 71 g

2.- Use proportions and cross multiplications to find the percent by mass of F. The molar mass of NF₃ is equal to 100%.

                       71 g of NF₃ ------------------ 100%

                       57 g of F   ------------------- x

                            x = (57 x 100)/71

                            x = 5700 / 71

                            x = 80.3%

3.- Conclusion

Fluorine is 80.3% by mass of the molecule NF₃

           

3 0
3 years ago
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nirvana33 [79]
I would say b and d but I wouldn’t really know :/
4 0
3 years ago
Calculate the grams of CaCl2 necessary to make a 0.15Msolution.
xxTIMURxx [149]

Answer: mass m = M·c·V

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n=m/M= cV, volume of Solution is not mentioned

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Which type of drug commonly marketed to consumers does not require a prescription?
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Which of the following is the best instrument to use to prepare a solution?
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