Question

Please Show All Work

SHOW ALL UNITS IN YOUR CALCULATIONS AND ANSWERS FOR CREDIT 1. The mass of a single atom of an unknown element is 1.792x1022 grams. Answer the following questions about this unknown element. a) What is the mass of one atom of the unknown element in atomic mass units (amu)? Hint: 1 amu 1.661x1024 g (3 pts) Answer: b) How many atoms of this unknown element are there in 1.00 mole of this element? (1 pt) Answer: c) What is the molar mass of the unknown element in units of grams per mole? (2 pts) Answer d) How many moles of the unknown element are there in 10.00 grams of the element? (3 pts) Answer: e) How many molecules of the unknown element are there in 0.500 moles of the element? (3 pts) Answer f) What is the identity of this unknown element? (2 pts) Answer: 14

0 0
Add a comment Improve this question Transcribed image text
Answer #1

Hi Dear Friend, the Answers are in bold.

a) (1.792 x 10-22g ) / (1.661 x 10-24 g) = 107.8868 a.m.u

b) 1 mole of any element contains 6.023 x 1023 atoms according to Avagadro's number.

c) a.m.u is also called as gram / mole, therefore molar mass of unknown element = 107.8868 g/mol

d) moles in 10.00 grams of unknown element = mass of unknown element / molar mass of unknown element

moles = 10.00 g / 107.8868 g/mol = ~ 0.1 mole.

e) 1 mole of any element contains 6.023 x 1023 atoms/molecules

0.5 mole have molecules = 0.5 x 6.023 x 1023 molecules = 3.0115 x 1023 molecules.

f) The atomic mass closely resembles to silver Ag. Identity of unknown element is Ag.

SHOW ALL UNITS IN YOUR CALCULATIONS AND ANSWERS FOR CREDIT 1. The mass of a single atom of an unknown element is 1.792x102 gr

Hope this helped you!

Thank You So Much! Please Rate this answer as you wish.("Thumbs Up")

Add a comment
Know the answer?
Add Answer to:
Please Show All Work SHOW ALL UNITS IN YOUR CALCULATIONS AND ANSWERS FOR CREDIT 1. The...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
  • Conversions. SHOW YOUR WORK! You will be graded on correct units and setup as well as...

    Conversions. SHOW YOUR WORK! You will be graded on correct units and setup as well as the final answer. Note: for molar mass, use all digits given on the periodic table (do not round the molar mass). How many molecules of CHO are in 2.67 moles of C3H2O? Answer = What is the mass, in grams, of 9.57 x 1022 atoms of Ca? Answer =

  • These problems all require you to show your work and there will not be any credit given without math/work for a pro...

    These problems all require you to show your work and there will not be any credit given without math/work for a problem. 1. Naturally occurring iodine has atomic mass of 126.9045 amu. A 12.3849 gram sample of iodine is accidentally contaminated with an additional 1.0070 grams of 12, a synthetic isotope used to treat diseases of the thyroid. The mass of lodine 129 is 128.9050 amu. Find the apparent "atomic mass" of the contaminated iodine. (Show the math for this.)...

  • please complete the questions has not answering with clarification of the answer to any page Name...

    please complete the questions has not answering with clarification of the answer to any page Name Lab Section _Date The Mole Concept and Atomic Weights The purpose of this activity is to better understand the concepts of relative atomic mass, counting by weighing and the mole. Percent composition and average atomic mass are included. Part I. Relative Atomic Masses and the Mole - Early Method When John Dalton proposed his atomic theory, he stated that the atoms of each element...

  • 1. The molecule carbon dioxide has the molecular formula CO2. a. How many carbon and oxygen atoms does each carbon...

    1. The molecule carbon dioxide has the molecular formula CO2. a. How many carbon and oxygen atoms does each carbon dioxide molecule contain? b. Find the average mass of one carbon dioxide molecule in amu. Show how you reached your answer. C. How many moles of carbon atoms are there in 1 mole of carbon dioxide? d. How many moles of oxygen atoms are there in 1 mole of carbon dioxide? e. Find the mass of one mole of carbon...

  • 1.According to the periodic table, a single (1 exactly) carbon atom has a mass of 12.011...

    1.According to the periodic table, a single (1 exactly) carbon atom has a mass of 12.011 amu. What is the mass of a single carbon atom in grams? 2. How many carbon atoms does it take to equal 12.011 grams? Complete the dimensional analysis set up provided for you (Hint: Your answer to question 1 can help answer this question). (Round to 3 sig figs) 3. According to the periodic table, a single phosphorus atom has a mass of 30.973...

  • Name: Makeup Lab Assignment 1. Calculate the molar mass of each of the following molecules. Show your work and roun...

    Name: Makeup Lab Assignment 1. Calculate the molar mass of each of the following molecules. Show your work and round your answer to the nearest gram/mole (3 points): a. CH BrCIF b. (NH),SO C. Fe, 2. How many atoms of Hare in 2.20 moles of (NH),PO.. Show your work, include units and round your answer to three significant figures (5 points).

  • Use your student number to create your values below. Give your answers to the significant figures....

    Use your student number to create your values below. Give your answers to the significant figures. Circle your final answers. 1. The element Mohawkium (Mk) has 3 naturally occurring isotopes: Isotope Atomic Mass Natural Abundance MK-A 1Y. ZU % 15.28 2 Mk-B 11X. UV amu 112.80 amu 11Y. WX amu [115. 12 amu 11Z. YZ amu 17.57 7Z. WX % 27.24 Mk- C Calculate the atomic mass of Mk. 2. Calculate the number of moles in Z.YXWg for ferrous oxide....

  • General Chemisto Workshop 9: The Mole The mole is the unit of measurement for an amount...

    General Chemisto Workshop 9: The Mole The mole is the unit of measurement for an amount in chemistry and physics. It is defined as the amount of sample that contains as many items as there are atoms in 12 grams of carbon-12 ( Isotope). The number of items in 1 mole is called the Avogadro's number NA 6.022141 x 1023 1 le t o Mole in science, just like a dozen in our everyday life, allows us to quickly count...

  • Calculations: SHOW WORK on separate paper. Use correct number of significant figures and report units with...

    Calculations: SHOW WORK on separate paper. Use correct number of significant figures and report units with answers where required. 1. Find the number of moles in 25.0 grams of each of the following: Find the a. Ni b. C.H. c. Ca(OH)2 Find the mass of 0.750 moles of each of the following: Brz b. P.010 CuS 3. Find the number of particles in 35.0 grams of each of the following: a. Ag b. CF4 C. CHO Find the mass of...

  • HELP AS SOON AS POSSIBLE Use the periodic table of fake elements in the first photo...

    HELP AS SOON AS POSSIBLE Use the periodic table of fake elements in the first photo to answer the following questions. Anyone willing to help will receive a very very good review! Your help is greatly appreciated. Periodic Table of 'Fake' Elements This periodic table will be used for online quizzes and exams and will be provided with questions when it is need to answer a question. Your instructor will use the element symbols and their average atomic masses to...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT