I'm totally stuck; please if you could get any of these solved so that i can go ahead with the hints and help myself out... It's tragic! -A cube of redwood 3.00 cm on an edge weighs 11.8 g. What's its density? -A beaker containing 4.00 x 10^2 cm^3 of a liquid having a density of 1.85 gcm^3 is found to weigh 884 g. What is the mass of the empty beaker? -4.90 kg of water is heated from 15 to 48 degrees celcius. How much heat is absorbed by the water? In Kilocalories/Kjoles? -A sample with 7.5x10^21 molecules of Cyclohexane contains 4.5x10^21 carbon atoms and 9.0x10^21 hydrogen atoms. Empirical/Molecular formulae? -How many moles of Hydrogen atoms are necessary to combine with 7.0x10^-4 mol of Nitrogen atoms to form the compound Ammonia? -Given eight atoms of Oxygen; how many molecules of the compounds N20, NO, CO2, N204, (any you prefer...) are possible to make?