An element has two naturally occurring isotopes with atomic masses of 112.90 amu and 114.90 amu. the relative abundances of these isotopes are 4.29% and 95.71%, respectively. what is the average atomic mass of the element? a.22.78 amu b.113.9 amu c.114.8 amu d.227.8 amu

C. 114.8 u

Explanation:

The atomic mass of X is the weighted average of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its percent of the total).

Set up a table for easy calculation

0.0429 × 112.90 u =     4.843 u

0.9571  × 114.90 u = 109.97    u

                 TOTAL = 114.8       u

a is the answer

explanation:

which statement about trans-fatty acids is false?

a. the conversion of cis-fatty acids to trans-fatty acids is inhibited by the presence of antioxidants.

hope this

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.