An unknown element (Uk) has three isotopes, seen in the table. One of the percentage values is missing. Percent Abundance Isotope Notation Mass (amu) (%) Uk-66 65.994 56.00 Uk-69 68.958 14.00 Uk-71 70.975 Once you have found the missing percentage, calculate the average atomic mass of Uk. Enter your answer to the hu

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A: Number of moles = mass ÷ molar mass Number of atoms in 1 mol = 6.022 x 1023

Q: Complete the table. Element Mass Moles Number of Atoms Na 38.5 mg C 1.12 V 214 Hg 1.44 kg

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Q: Chemistry Calculate the mass, in kg, of each sample. 7.74×1027 nickel atoms.

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Q: The two isotopes are N-14 and N-15. Nitrogen's atomic weight is 14.007.Calculate the percent…

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Q: Determine the number of atoms in 33.0 grams of calcium, Ca. (The mass of one mole of calcium is…

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Q: None

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Q: Element Kittypurrium (named after one of TA's cats) has two isotopes: Isotope 1 has an atomic…

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Q: Calculate the precise mass of each ion to five significant figures. Unless otherwise indicated, use…

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Q: 320 g of a certain chemical element contains 4.82 x 1024 atoms. Find the name of the element. MAr…

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.