You have a 10.0 g sample of gallium-68. Half of it decays in 68.3 minutes. How much will be left after two half-lives? Make sure to round to the correct number of significant figures and use units (g)

whats the meaning of /

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

i believe it is c.) 1575 j.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).