PLEASE HELP ASAP A rock originally had 4800 atoms of 40K and no 40Ar. It now has 800 atoms of 40K. Assuming that the only chemical process is radioactive decay of potassium to argon,

a) 1.576 billion years
b) 1.375 billion years
c) 3.357 billion years
d) 4.660 billion years
e) 5.303 billion years

what is the age of the rock?

4moles of nitrogen gas are confined to a 6.0 l vessel at 177 °c and 12.0 atm. if the vessel is allowed to expand isothermally to 36.0 l, what would be the final pressure?

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2