Two isotopes of gallium are naturally occurring, with Ga at 60.11% (68.93 amu) and Ga at 39.89% (70.92 amu). Calculate the atomic mass for gallium using the weighted 31 average mass method. Express your answer using four significant figures. amu Submit Request Answer

Two isotopes of gallium are naturally occurring, with Ga at 60.11% (68.93 amu) and Ga at 39.89% (70.92 amu). Calculate the atomic mass for gallium using the weighted 31 average mass method. Express your answer using four significant figures. amu Submit Request Answer

Introduction to General, Organic and Biochemistry

11th Edition

ISBN:9781285869759

Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Chapter2: Atoms

Section: Chapter Questions

Problem 2.83P: 2-83 The natural abundance of boron isotopes is as follows: 19.9sf boron-l0 (10.013 amu) and 80.1%...

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2-83 The natural abundance of boron isotopes is as follows: 19.9sf boron-l0 (10.013 amu) and 80.1% boron-11 (11.009 amu). Calculate the atomic weight of boron (watch the significant figures) and compare your calculated value with that given in the Periodic Table.
2-17 How does Dalton’s atomic theory explain: (a) the law of conservation of mass? (b) the law of constant composition?
Atomic weights are not provided, but please use rounded-off values to the nearest whole number.(examples: 24.305, use "24"; 107.8682, use "108"; 1.00784, use "1"; 15.999, use "16") Add trailing zeros to complete your answer to the 3rd decimal place, if necessary. (examples: if your answer is "62.7", write it as 62.700; if your answer is "37.12", write it as 37.120if your answer is "123", write it as 123.000) 1. A 3.50-gram sample of Streptomycin powder was tested for its water content. If the water equivalence factor of the KF reagent was 4.6, what is the percentage water content of the sample if 9.2 ml of the KF reagent was used? 2. An analyst accurately weighed 5.351 grams of sample for ash-insoluble content using the dry method. The weight of the crucible containing the ash was 40.722 grams. If the sample was said to have 2.150% of insoluble ash, what is the weight of the tared crucible?
Atomic weights are not provided, but please use rounded-off values to the nearest whole number.(examples: 24.305, use "24"; 107.8682, use "108"; 1.00784, use "1"; 15.999, use "16") Add trailing zeros to complete your answer to the 3rd decimal place, if necessary. (examples: if your answer is "62.7", write it as 62.700; if your answer is "37.12", write it as 37.120if your answer is "123", write it as 123.000) 1. A 1.2-gram sample of lanolin was treated with Wij’s solution and excess potassium iodide solution. The liberated iodine reacted with 30 ml of 0.1 N sodium thiosulfate solution. If the iodine value was determined as 12.69, what is the volume used in blank titration? 2. A 500mg oil sample is taken from a conical flask and is dissolved in 50mL distilled alcohol. An indicator is added and is then titrated against 0.112N KOH until a slight pink color appears. It took 17.6mL of the titrant to reach the endpoint. What is the sample’s Acid Value?
Atomic weights are not provided, but please use rounded-off values to the nearest whole number.(examples: 24.305, use "24"; 107.8682, use "108"; 1.00784, use "1"; 15.999, use "16") Add trailing zeros to complete your answer to the 3rd decimal place, if necessary. (examples: if your answer is "62.7", write it as 62.700; if your answer is "37.12", write it as 37.120if your answer is "123", write it as 123.000) 1. A 1.2-gram sample of lanolin was treated with Wij’s solution and excess potassium iodide solution. The liberated iodine reacted with 30 ml of 0.1 N sodium thiosulfate solution. If the iodine value was determined as 12.69, what is the volume used in blank titration? 2. An analyst accurately weighed 5.351 grams of sample for ash-insoluble content using the dry method. The weight of the crucible containing the ash was 40.722 grams. If the sample was said to have 2.150% of insoluble ash, what is the weight of the tared crucible?
The natural abundance of 3He is 0.000137%. (a) How manyprotons, neutrons, and electrons are in an atom of 3He?(b) Based on the sum of the masses of their subatomic particles,which is expected to be more massive, an atom of 3He oran atom of 3H (which is also called tritium)? (c) Based on youranswer to part (b), what would need to be the precision of amass spectrometer that is able to differentiate between peaksthat are due to 3He+ and 3H+?
Use the isotope data to calculate the relative atomic mass of Si, to 8 s.f. = __________________ Isotope m/amu % abundance 28Si 27.97692653 92.22 % 29Si 28.97649470 find: _____ 30Si 29.97377017 3.09 %
Calculate the atomic mass of each of the following elements using the given data for the percentage abundance and mass of each isotope. Include the unit. No need to show your solution.Lithium: 7.42% 6Li (6.01 amu) and 92.58% 7Li(7.02 amu)Answer: _________________Magnesium: 78.99% 24Mg (23.99 amu), 10.00% 25Mg(24.99 amu), and 11.01% 26Mg (25.98 amu)Answer: _________________
Boron (B; Z=5) has two naturally occurring isotopes. Find the percent abundances of 10B and 11B given the atomic mass of B=10.81 amu, the isotopic mass of 10B = 10.0129 amu, and the isotopic mass of 11B = 11.0093 amu. (Hint: the sum of the fractional abundances is 1. If x = abundance of 10B, then 1-x=abundance of 11B) Atomic Wt = Isotopic Mass 10B(proportion) + Isotopic Mass 11B(proportion)
A hypothetical element exists as two isotopes: I = 85.50 amu and II = 88.70 amu. If the percent abundance of isotope I is (2.16x10^1)%, what would be the calculated atomic mass (in amu)? Enter your answer in scientific notation with 3 sig figs. Do not include any units in your answer. Do not round any intermediate calculations. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer:
Below is a representation of 50 atoms of a fictitious element called westmontium (Wt)(Wt). The red spheres represent WtWt-296, the blue spheres WtWt-297, and the green spheres WtWt-298. A)Assuming that the sample is statistically representative of a naturally occurring sample, calculate the percent natural abundance of WtWt-296 isotope. Natural abundance of WtWt-296? B)Assuming that the sample is statistically representative of a naturally occurring sample, calculate the percent natural abundance of WtWt-297 isotope. Natural abundance of WtWt-297? C)Assuming that the sample is statistically representative of a naturally occurring sample, calculate the percent natural abundance of WtWt-298 isotope. Natural abundance of WtWt-298?
Lithium exists as 2 isotopes. Research each isotope and include the relative abundance, atomic number, atomic mass, and noteworthy use of each. Cite your reference in the answer. I need help