(adsbygoogle = window.adsbygoogle || []).push({}); what i did: suppose a nameless element (X) was found to occur in three different substances (A, B and C). The relative molecular masses of A, B, and C were found to be 27.40, 52.90 and 62.60 respectively, compared to an assigned value of exactly 2.00 for H2. Subsequently, these substances were subjected to elemental analysis and were found to contain 78.1%, 81.1% and 85.6% of X respectively by mass.

What is the (likely) relative atomic mass of X, on this scale?

27.40 * 0.781 = 21.4

52.9 * 0.811 = 42.9

62.6 * 0.856 = 53.59

there is a hint that saysi have no idea how to get the common factor with those numbers.. Work out the mass of X in the each of the molecules A, B, and C from the percentages of X and the molecular masses. Then find the highest common factor (also called the highest common divisor or the greatest common factor).

btw i had no idea where i can post this in here so i posted here :X

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Determination of Atomic Masses help

**Physics Forums | Science Articles, Homework Help, Discussion**