- Cobalt 60 has a half life of 5 years. how many grams of a 300 g sample will remain after 20 years?

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Formula de tributan amida? Why does graphite and buckyballs have good lubricating properties? Write the value of stars and smilies ,if 190+78=200+stars=smilies? If a^= b+c, b^2= c+a and c^2= a+b then find the value of 1/(a+1) + 1/(b+1) + 1/(c+1)=? What would the corresponding concentration values of OH - be for the pH values: 1, 3, 5, 7, 9, 11?