How much thermal energy (q) is required to heat 15.2 g of a metal (specific heat = 0.397 j/g) from 21.0 degrees c to 40.3 degree c

We can use:
Q = mCpΔT
Q = 15.2 x 0.379 x (40.3 - 21)
Q = 111.2 Joules

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o