Atomic mass Definition and 63 Threads

On the P.T.E., the atomic mass number of an element gives the number of protons and neutrons in its nucleus, ie. the number of particles in its nucleus. But this number also gives that particular elements molar mass, correct? eg. For carbon, it has 12 particles in its nucleus, and its molar mass...

Homework Statement In Clark's tables, the atomic masses of various isotopes are given which are decimal form. Are these experimentally obtained masses? Moreover, while writing nuclear reactions we do not use these, instead they are represented as integers. Is it just for convenience or is...

sorry, I'm having trouble grasping a lot of this... i feel like i have a general understanding of what's going on but a lot of the problems are still confusing to me... this problem An element in its solid phase has mass density 1750 kg/m3 and number density 4.39 * 10^28 atoms/m3. asks...

I was wondering average atomic mass is of a fully grown male human. What I mean by this is, if we consider the human body to be comprised of mainly Carbon, Hydrogen, Oxygen, Nitrogen and other trace elements like Calcium, Sodium, Phosphorus, etc. Is it possible to determine an estimate about...

Been many years since I took general and org chem and am currently reading general chem textbook as refresher. Came across defintion of amu (atomic mass unit). Text says that the mass of the carbon-12 atom is defined to be exactly 12 amu. However, a couple of pages over, I read that the mass of...

Hi guys I understand that the unified atomic mass unit is defined as 1/12 of the mass of a carbon-12 isotope and has a value of 1.66 X 10^-27kg. Why is this value slightly different with when I use the calculation 0.012/6.02 X10^23? Why in theory, is the mass of a protn different from a...

which is more important to the chemical behaviour of an element? cant seem to find this anwhere

how do you convert the atomic mass unit into kgs?

How would you go about to solve this quesiton? I thought that to calculate this i had to set up an equation as: let x = the percentage of 85-Rb 84.91*x + 86.91*(1-x) = 85 x = 96%, but that's obviously wrong. How do i solve this question?

When an evacuated glass bulb of 1.00 dm3 capacity was filled with a sample of krypton at a pressure of 1.00 X 105 Pa and at a temperature of 300K, its mass increased by 3.32 g. Calculate the average Relative Atomic Mass of this sample of krypton. It's the 'mass increased by 3.32g' part that...

relative atomic mass of an element ? A sample of neon was found to cotain 90.9% of 20Ne, 0.26% of 21Ne, & 8.8% of 22Ne, Calculate the relative atomic mass of neon. this is what i'v done so far (90.9x 20)+ (0.26x21)+(8.8x22)= 2017/? i don't know what to divide it by :confused: ? I'm not...

The Atomic Mass! Hello, I have a problem of getting the answer of this question and I still don't understand it. The question is What I though is that the answer is "1,700,000,000,000,000,000" and I thought it's same as when we say we have a red apple and how many red apples are in...

A pi meson has mass of 139MeV/c^2. what is this in atomic mass? HOw do i solve for this? what steps do I need to do, any examples you can give to help me with to solve? Dx :wink: