What is the correct Lewis Structure for ClO4-?

a metal sample weighing 71.9 g and at a temperature of 100.0 degree C was placed in 41.0 g of water in a calorimeter at 24.5 degree C. At equilibrium the temperature of the water and metal was 35.0 degree C. what was delta t for the water?

he pressure inside a hydrogen-filled container was 2.10 \rm atm at 21 ^\circ\rm C. What would the pressure be if the container was heated to 87 \,^\circ C?

At body temperature 2,404 joules of energy are required to evaporate 1.00 g of water. After vigorous exercise, a person feels chilly because the body is giving up heat to evaporate the perspiration. A typical person perspires 25 mL of water after 20. minutes of exercise. How much body heat is...

what is the theoretical percent water in Fe(NO3).7H2O

A solution of 114 mL of 0.190 M \m KOH is mixed with a solution of 230 mL of 0.250 M \rm NiSO_4. What is the concentration of {\rm K}^{+} that remains in solution?

In a coffee-cup calorimeter, 1.10 g of NH4NO3 is mixed with 72.0 g of water at an initial temperature of 25.00 C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.83 C. Assuming the solution has a heat capacity of 4.18 J/ C g and assuming no heat loss to...

what's is the mass of oxygen gas is required in order to release 6670kJ to the surrounding by the following reaction? CH4 + 2O2----->CO2 + 2H2O DELTA H= -890 kJ

A 1.60-g sample of a large biomolecule was dissolved in 15.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85 C. Calculate the molar mass of the biomolecule. For carbon tetrachloride, the boiling point constant is 5.03 C kg/mol, and the boiling point...

isomer of C2H2Br2, what are all three shapes of isomer