What is the atomic mass of the more massive isotope of element X? Mass Spectrum

Question

What is the atomic mass of the more massive isotope of element X?

Mass Spectrum of Molecular Parent Ion (4parts) Hass Spectrum of IX2F The spectrum shows three vertical bars corresponding to the molecular masses labeled on the x-axis. The height lodine has only a single, stable, naturally occurring isotope (27t atomic mass 126.90447 amu). Fluorine has only a single, stable, naturally-occurring isotope (19f atomic mass 18.98340322 amu). There are exactly two stable naturally-occurring isotopes of element of each bar gives the fraction of all molecules having the corresponding mass. 0.5 0. 4999 What is the atomic mass of the more massive isotope of element X? 1prs .4 Submit Answer Tries 1/5 Preyious Tries What is the atomic mass of the less massive isotope of element X? 0. 3 tpts Submit Answer Tries 0/5 . 2569 0. 2431 What is the percent natural abundance of the less massive isotope of element X7 0.2 1pts Submit Answer Tries 0/5 What is the molar mass of the compound IX2F? 0.1 g/mol ipts Submit Answer Tries 0/5 303.72955 305. 72750 307. 72545 Mass/Charge (amu/e) Threaded View Chronological View Other Views . Export

Explanation / Answer

Mass of heaviest isotope compound (IX2F) = 307.72545

mass of I + 2 * mass of X + mass of F = 307.72545

126.90447 +  2 * mass of X + 18.98840 = 307.72545

2 * mass of X = 161.82358

mass of X = 80.91629

Mass of lightest isotope compound (IX2F) = 303.72955

mass of I + 2 * mass of X + mass of F = 303.72955

126.90447 +  2 * mass of X + 18.98840 = 303.72955

mass of X = 78.91834

Percentage abundance of less heavy isotope will be 25.69%

Molar masss of compound IX2F = 0.2569 * 303.72955 + 0.4999 * 305.72750 + 0.2431 * 307.72545 = 305.66936

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