1.An element consists of three isotopes with masses of 28, 29, & 30 amu. The relative abundances of these three isotopes are 92.23%, 4.67%, & 3.10% respectively. What is the average atomic mass of this element? 2. A naturally occurring element that is 75.53 percent 35 amu and 24.47 percent 37 amu. Calculate the average atomic mass. *
3.Rubidium is a soft, silvery-white metal commonly used to give fireworks their purple color. It has two common isotopes, Rb-85 and Rb-87. If the abundance of Rb-85 is 72.2% and the abundance of Rb-87 is 27.8%, what is the average atomic mass of rubidium?
4.Without doing any calculations, if you were told that an element has 80% of an isotope with a mass of 49 amu and 20% of an isotope with a mass of 51 amu, what would you estimate the average atomic mass to be?

2points what is the job of a scientist? a. to answer ethical questions. b. to write laws based on his or her knowledge. c. to ask and answer scientific questions. d. to ignore facts that do not support his or her theory.

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl+4h2o enter the elemental symbol. view available hint(s) is reduced

Determine the reaction and balance the following equations urgent due in the morning