4.40 Two isotopes of rubidium occur naturally, Rb and Rb. Which isotope of rubidium is more abundant?

Q: An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.37…

A: 4. Given that,  An element X has two isotopes such as 120X and 122X. Atomic mass of 120X, MX120 =…

Q: Almost all boron atoms are found in two forms: boron-10 and boron-11. Both isotopes behave alike…

A: Given, Boron atoms are found in two forms: boron-10 and boron-11 Average mass of B = 10.81 amu

Q: While roaming a parallel universe, you discover the hypothetical element "Z." You obtain a…

A: We need to calculate the atomic weight of the element Z.

Q: a 500-mg antacid tablet has 105 mg calcium carbonate (MW = 84.3139 g/mol). What is the %(w/w) of…

A:

Q: An unknown element is a mixture of isotopes 120X and 122X.  The average atomic mass is 120.70.  What…

A: Suppose percentage abundance of 122X = A percentage abundance of  120X = (100 - A) Fraction of 122X…

Q: . An element has three stable isotopes with masses of 27.977 amu, 28,976 amu, and 29.973 amu. The…

A:

Q: An element 'A' contains 4 protons, 4 electrons and 5 neutrons. it is + 1. It becomes when it has 4…

A: For a neutral atom, the number of electrons or protons is equal to its atomic number. The mass…

Q: 2.105 For the noble gases (the Group 8A elements) ¿He, 10Ne, 18 Ar, Kr, and Xe, (a) determine the…

A: The atomic number defined as the number of electrons or number of protons present in a neutral atom.…

Q: There are two naturally occurring isotopes of rubidium. What is the abundance of each isotope?…

A: The abundance of each isotope is to be calculated.

Q: 21.3 gram of salt E(NO)3  are dissolved in 500 ml of solution.The concentration of (NO3-) is 0.6…

A: Given data:

Q: 2.2 Rhenium (Re) occurs naturally in two distinct isotopes, 185 Re and 187 Re, with an average…

A:

Q: If an isotope has 90 protons, how many neutrons are required in order for it to have a stable atomic…

A: Concept-: Isotope: Isotopes are known as members of a family of an element which all have the same…

Q: Assume that Element Q has the following three isotopes: 248 Q, 252 Q, and 259 Q. If the atomic mass…

A: Average atomic weight is the sum of the masses of the individual isotopes each multiplied by its…

Q: What is the mass number (A) of a calcium isotope that has 19 neutrons?

A: Answer :-  The mass number (A) of a Calcium isotope that has 19 neutrons = 39…

Q: What is an atomic mass unit? Why is it necessary to introduce such a unit?

A: Matters are the substances that possess some mass and volume. These are formed by joining very small…

Q: 10. Which of the following choices consists of a pair of isotopes? (A) 14C and 14N (B) 2³Na and…

A: Isotopes are variants of chemical elements which differ only in the number of neutron and…

Q: 49.31%. What is the relative atomic mass of Br? 2.9. An isotope of lead has an isotopic mass of 208.…

A:

Q: An imaginary element Z has two naturally occurring isotopes, ³Z and 4Z. ³Z has a mass of 3.016 amu,…

A:

Q: The elements in Groups 1A(1) and 7A(17) are all quite reactive. What is a major difference between…

A: The elements in Groups 1A(1) and 7A(17) are all quite reactive. What is a major difference between…

Q: 2. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. What does…

A: Answer: 75 Proton and 110 Neutron. Given,Element of Rhenium (Re) exist as two stable isotopes and 18…

Q: isotopes of each other

A: An isotope means the same atomic number, but different numbers of neutrons in the nucleus.

Q: Bromine has only two natural isotopes, and they occur in about equal abundance.   If 79Br79Br is…

A: Average atomic mass of an element is obtained by the sum of the product of isotopic mass and natural…

Q: An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass…

A: Two naturally occurring isotopes.i. Abundance of 37.4% and an isotopic mass of 184.953 amuii.…

Q: 12. Rubidium is a soft, silvery-white metal that has two common isotopes, Rb and "Rb. If the…

A: An atom is composed of three main sub-atomic particles; electrons, neutrons and protons. The atomic…

Q: What are the factors that affect the average atomic mass of a mixture of isotopes?

A:

Q: Ammonia is a gas with a characteristic pungent odor. It is sold as a water solution for use in…

A: Given information,

Q: On a mission to a newly discovered planet, an astronaut finds gallium abundances of 60.11 %% for…

A: The average atomic mass of an element can be calculated as shown below.

Q: - Argon has three naturally occurring isotopes: 0.337% 36Ar, 0.063% 38Ar, and 99.60% 4ºAr. Estimate…

A: Given : There are 3 naturally occurring isotopes of Argon i.e Ar.

Q: If a sample of gallium contains 1.56×104 atoms of gallium-69 and 1.02×104 atoms of gallium-71, what…

A: Given,1.56×104 atoms of gallium 69.1.02×104 atoms of gallium 71.

Q: an unknown element is a mixture of isotopes 120X and 122X. the average atomic mass of X is…

A:

Q: Lithium has 2 stable isotopes Li-6 and Li-7. One of them has an abundace of 92.5% and the other has…

A: Since the atomic mass of any element is average atomic mass of its isotopes. hence the atomic mass…

Q: One isotope has an atomic weight of 408.5 atm and a percent abundance of 23.0% while the other…

A: To calculate the atomic weight of the element, multiple the percent abundance with respective weight…

Q: An atom of 131 I contains ________ protons.

A: An atom = 131I  Number of protons = ?

Q: An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The…

A: The average atomic mass of an element is calculated by considering the atomic mass of each isotope…

Q: An atom has a very small nucleus surrounded by an electron "cloud." The figure below represents the…

A: The diameter of the nucleus is given that 2 mm. The electron cloud or diameter of atom is 200m. That…

Q: Lithium naturally exists as two isotopes: lithium-6, with an abundance of 7.6%, and lithium-7, with…

A: The relative atomic mass of lithium = 6.9399 amu.

Q: There are two naturally occurring isotopes of europium, 151Eu(151.0 amu) and 153Eu(153.0 amu). If…

A: Given information:Two isotopes of europium, 151Eu (151.0 amu) and 153Eu (153.0 amu)Atomic mass of Eu…

Q: 4. Which of the following statements are trme of chemical reactions? a. The number and types of…

A: Which of the following statements are true of chemical reactions?

Q: The isotope of plutonium "Pu is used to make thermoelectric power sources for spacecraft. Suppose…

A:

Q: The atomic weight of Chlorine is 35.45 and its naturally occurring isotopes are Cl-35 and Cl-37.…

A:

Q: Ammonia is a gas with a characteristic pungent odor. It is sold as a water solution for use in…

A: Mole Moles is a quantity that represents a collection of 6.022×1023 atoms or molecules. The…

Q: An unknown element is a mixture of isotopes 151X and 153X. The average atomic mass of X is 151.69…

A:

Q: A hypothetical element exists as two isotopes: I = 68.00 amu and II = 71.00 amu. If the percent…

A:

Q: A hypothetical element Q (atomic mass: 142.61) consists of two stable isotopes: 45.3 % isotope A…

A: Relative abundance of isotope A is 0.453(45.3%) and hence, relative abundance of isotope B is 0.547…