If i have -241. 82kj how much energy must be added to two more h2o (g) to cause it to decompose into h2 or 02

Use the measurements in the table to determine which unidentified metal has the highest density. metal volume mass a 10.5 cm3 122 g b 14.2 cm3 132 g c 16.1 cm3 115 g d 12.7 cm3 126 g

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.

Complete the following radioactive decay problem. tan+on-? c+th