A atom X has two naturally occurring isotopes. One isotope has a natural abundance of 71.99% with a mass of 83.55 amu. (A) If the atomic mass of element X is 91.78 amu, please calculate the mass of the other isotope. (B) If you have 109.23 grams of X, determine the number of atoms of each isotope you have.

Q: Consider a rectangular piece of printer paper that is 8.5’’ x 11’’ (’’ denotes inches). In order to…

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Q: An atom of calcium is represented by 12C.. How many neutrons are in the nucleus of this atom?…

A:

Q: Two elements, R and Q, combine to form two binary compounds. In the first compound, 14.0 g of R…

A: Given: First Compound = 14.0 g R + 3.00 g Q  Second Compound =  7.00 g R + 4.50 g Q = RQ

Q: How many protons, neutrons, and electrons are in an atom of (a) 138Ba, (b) phosphorus-31?

A:

Q: Only two isotopes of boron (B) occur in nature; theiratomic masses and abundances are given in the…

A: Concept introduction: Isotope is defined as atoms of same element with same atomic number but…

Q: What is isobars and isotopes?

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Q: If the atomic mass of an element is X, what is the mass in grams of 1.027 x 1020 atoms of the…

A: Atomic mass of element (given)=X Number of atoms present =1.027×1020 atom

Q: In which of these compounds are there twice as many Oxygen atoms as Hydrogen atoms?

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Q: Consider the following atoms in which X represents the chemical symbol of the element:11/22X,…

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Q: Uranium-235 is used in nuclear fission. Determine the number of protons and the number of neutrons…

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Q: Uranium exists mainly as two isotopes in nature, possessing mass numbers 235 and 238. Write the full…

A: The atomic number of Uranium is 92. Hence number of protons in both isotopes = atomic number = 92

Q: a) The abundance of an isotope of silver (Ag) with mass number 109 is 48.17%. How many neutrons are…

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Q: What is an isotope? How are isotopes denoted?

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Q: If you have 13.02 x1023 atoms of nitrogen, what would you expect its mass to be?

A: Given, Number of Nitrogen atoms = 13.02 X 1023

Q: Iron exists in nature as a mixture of predominantly three isotopes: 26Fe (53.94 amu), 56 neFe (55.93…

A:

Q: The amount of carbon-14 in ancient artifacts and fossils is often used to establish their age.…

A: Given, the amount of Carbon-14 in ancient artifacts and fossils is often used to establish their…

Q: Iron exists in nature as a mixture of predominantly three isotopes: ⁵⁴₂₆Fe (53.94 amu), ⁵⁶₂₆Fe…

A: We have to calculate the percentage of rarest of three isotopes.

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 isotope is used as the standard in establishing the atomic mass scale?  The atomic weight of…

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Q: Describe and distinguish between thelaw of conservation of mass, the law ofconstant composition, and…

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Q: 3. A) Boron, element number 5, exists in only two common stable isotopes. They are B-10 and B-11.…

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Q: What mass of nickel would contain 5.66 x 1021 atoms?

A:

Q: If the reference for atomic masses of the elements were changed to 12C = 10.00 the relative atomic…

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Q: What is the mass of 6.02 x 1023 Cu atoms?

A:

Q: What is the symbol for the isotope of "Fe that possesses 31 neutrons? Express your answer as a…

A: To find: The symbol of the isotope of  55Fe which posses 31 neutrons.

Q: Which statement about subatomic particles are false? Protons and neutrons have charges of the same…

A: Proton, neutron and electrons are the subatomic particles present in an atom.

Q: What data must you know about the isotopes of an element to calculate the atomic mass of the…

A: The elements that have different atomic mass and same atomic number are known as isotopes.

Q: a) Which two of the following are isotopes of the same element:3116X, 3115X, 3216X? (b) What is the…

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Q: The water found on Earth is almost entirely made up of the 'H and 160 isotopes for a formula of H2O…

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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: What is the symbol for the isotope of 55 Fe that possesses 31 neutrons?

A: In isotope 55Fe there are 26 protons because the atomic number of Fe is 26, and the number of…

Q: Estimate the percentage of the total mass of a atom that is due to (a) electrons, (b) protons, and…

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Q: Which one of the following is the chemical symbol of an atom with 17 protons and 20 neutrons?

A:

Q: Write a symbol of an unknown or hypothetical element, then put on the proper place its atomic number…

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Q: Thallium has two stable isotopes, 203TIand 205TI. Knowing that the atomic weight of thallium is…

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Q: What is the % mass of oxygen in citric acid, C6H807?

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Q: There are two isotopes of the element lithium that occur naturally, 6Li (mass = 6.015 amu) and 7Li…

A: Let the percentage abundance of one of the isotope be x. Then the percentage abundance of another…

Q: When carbon and oxygen react, two different compounds can form dependingon the conditions. Compound…

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Q: The element copper has two naturally occurring isotopes with masses of 62.9400 amu and 64.9300 amu.…

A:

Q: One of the heaviest atoms found in nature is 238U. Its relativeatomic mass is 238.0508 on a scale in…

A: Given, 238U relative atomic mass is 238.0508

Q: (a) Which two of the following are isotopes of the same element:3116X, 3115X, 3216X? (b) What is the…

A: (a)  31 16X and 3216X are the isotopes of the same element .

Q: The mole is defined as the amount of a substance containing the same number of particles as exactly…

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Q: In a chemistry class, a group of students determined the mass-to-charge ratio for an electron to be…

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Q: potassium has three stable isotopes k-39, k-40 and k-41 but k-40 has a very low natural abundance.…

A: K  has 26 number of possible isotopes from 31K to 57K but among them only three are stable isotopes…

Q: An element X has two common isotopes: X-57 and X-59. If the average atomic mass of element X is…

A: An element has two isotopes : X-57 and X-59 Average Atomic mass = 58.876 amu