Carbon-14 has a half-life of 5730 years. After 17,190 years, only 3g remains. What was the mass of the original sample?

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In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)