How did elements with more than 2 protons, such as the carbon in our cells, form? A. They were formed at the same time as hydrogen and helium right after the big bang.
B. They formed 400 million years after the universe formed in giant fusion reactors known as stars.
C. They are formed when lighter elements are pulled together by gravity to form a planet.
D. They formed from hydrogen and helium slamming into each other in the first few minutes after the big bang.

a c d and f

just finished the assignment

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally