What is the concentration of a Kl solution of 20.68 g of solute was dissolved in enough water to form 100. ml of solution?

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

Gymnast always perform on padded mats. how does the mats protect the gymnast

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.)