2.5.1 Boron has two naturally occurring isotopes, 1°B and "B, which have masses 10.0129 and 11.0093 amu, respec- tively. Given the average atomic mass of boron (10.81 amu), determine the percent abundance of each isotope. a) 50% 1ºB, 50% "B d) 93% 'ºB, 7% B b) 20% 1°B, 80% "B e) 22% 1°в, 78% "в с) 98% 1°в, 2% "в
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- 3.1. Consider ¹2C, 13C and 13C- How many neutrons are found on each? How many electrons are found on each?What is the edge length (in cm) of a titanium cube that contains 2.55 * 10(24) titanium atoms? The density of titanium is 4.50 g/cm3.4. An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.37 amu. What is the percent abundance of ¹²²X? 5. You are working to earn enough money for a vacation which costs 1300.0 dollars. Your take-home pay is $16.50/hour, but you only work 4-hour shifts each day. How many days will it take for you to earn enough money to pay for your vacation if all the money you earn goes towards your vacation? 6. A student is determining the density of an unknown metal with a mass of 56.5 g. The student partially fills a graduated cylinder with water and measures the volume of the water by itself as 54.8 mL. The student then adds the metal to the water and measures the new volume as 87.3 mL. What is the density, in g/mL, of the metal? 7. A chemist has a block of lead metal (density is 11.3 g/mL). They drop the metal into a graduated cylinder containing water, and find the volume change is 2.70 mL. What is the mass of the block,…
- 4) Chlorine has two naturally occurring isotopes: Isotopes of Chlorine: Chlorine-35 Percent Abundance: Atomic Mass: 75.78% 34.969 amu 24.22% 36.966 amu Chlorine-37 Calculate the average atomic mass for the two isotopes of Chlorine. 5) Two isotopes of Bromine naturally occur: Isotopes of Bromine: Bromine-79 Atomic Mass: Percent Abundance: 50.69% 78.92 amu 49.31% 80.92 amu Bromine-81 Calculate the average atomic mass for the two isotopes of Bromine. 6) Lead has four naturally occurring isotopes: Isotopes of Lead: Atomic Mass: Percent Abundance: 1.4% 204 amu Lead-204 Lead-206 24.1% 206 amu Lead-207 22.1% 207 amu 52.4% 208 amu Lead-208 Calculate the average atomic mass for the four isotopes of Lead.What are the charge and mass of?: a) a singly ionized sodium atom, Na2+ (??????: 2311??, ????= 22.989 ?) b) the nucleus of a nitrogen atom (??????: 147 ?, ????= 14.007 ?)lake l/east.cengageno [References) Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29 (28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). Calculate the atomic weight of X. O 86.93 amu O 27.16 amu O 48.63 amu O 28.97 amu O 28.09 amu ot
- presented by Macmillan Learning Gallium is a metal which forms compounds with a wide variety of uses. Some of the applications of gallium compounds include computer memory chips, light emitting diodes and lasers. Radioactive isotopes of gallium are used to image the human body and locate tumors. Naturally occurring gallium consists of two isotopes. One of those isotopes is "Ga with an isotopic mass of 70.9247050 amu and an abundance of 39.892%. What is the mass number of the other isotope? mass number: TOOLS X10 Question Source: MRCpresented by Macmillan Learning Gallium is a metal which forms compounds with a wide variety of uses. Some of the applications of gallium compounds include computer memory chips, light emitting diodes and lasers. Radioactive isotopes of gallium are used to image the human body and locate tumors. Naturally occurring gallium consists of two isotopes. One of those isotopes is "Ga with an isotopic mass of 70.9247050 amu and an abundance of 39.892%. What is the mass number of the other isotope? mass number: Question Source: McQuarrie, Rock, And Gallogly 4e - General Chemsitry Publisher: University ScienII. COMPLETING THE TABLE. Fill in the gaps in the following table. Follow the number sequence indicated in the parenthesis,( ), to answer the missing data. (10 points) Number of neutrons Number of electrons (3) 88 (8) (10) Number of Atomic number 30 Mass number (1) 226 Atom protons (2) (5) (7) 35 35 Zn Ra Fes (4) 26 (6) (9) 45 56 Br 35 80
- ir Symbol x 9688530/6968853/21/-1 re: Macmillan Learning Question 22 of 29-Ch 2 Home X 65.5% QAn atom or ion has 43 neutrons x + atomic mass of 33 Cr Resources Hint Chromium has an atomic mass of 51.9961 u and consists of four isotopes, 50 Cr. 52 Cr, 53 Cr, and 54 Cr. The 52 Cr isotope has a natural abundance of 83.79% and an atomic mass of 51.9405 u. The 54 Cr isotope has a natural abundance of 2.37% and an atomic mass of 53.9389 u. The natural abundances of the 50 Cr and 53 Cr isotopes exist in a ratio of 0.4579:1, and the 50 Cr isotope has an atomic mass of 49.9460 u. Determine the atomic mass of the Cr isotope. AL Che 4 uBoron and sulfur form two binary compounds. The first contains 0.2247 g B/1.000 g S, and the second contains 0.1348 g B/1.000 g S. If the formula for the first compound is a multiple of B2S3, then the second is a multiple of: (AW: ? ... B=10.811; S=32.065) A B2S5 B257 (c) BS3 BS23.2. Chromium, a micromineral needed for maintenance of blood sugar levels, has four naturally occurring isotopes. Calculate the number of protons and number of neutrons in each of the following isotopes: 53 24 af tha fallawina: Cr 50 24 52 24 Cr Cr enb