How many moles of NH4NO3 (s) must be dissolved in water so that 73.0 kJ of heat is absorbed from the water? (The molar heat of solution of NH4NO3 is 25.7 kJ/mol.)

An atom has an atomic mass of 27 and 13 neutrons, how many electrons will this atom have?

Determine the mass of iron in 79.2 g of Fe2O3.

Which is true about fossil fuels? A. Coal and natural gas came from swamp environments, while oil came from open oceans. B. Coal came from swampy environments, while oil and natural gas came from open ocean environments. C.

A 22.4-L sample of which of the following substances, at STP, would contain 6.02 X 10^23 representative particles? a) oxygen b) gold c) cesium iodide d) sulfur

Why are elements within the same group on the periodic table are considered family members

Which compound is inorganic? a. glucose (c6hl2o6) b. carbon dioxide (co2) c. ethane (c2h6) d. stearic acid (cl8h36o2) ?

Pure aluminum metal has a density of 2.70 g/cm

A 0.250-g chunk of sodium metal is cautiously dropped into a mixture of 50.0 g of water and 50.0 g of ice, both at 08C. The reaction is 2Na (s) 1 2H2O (l) 88n 2NaOH (aq) 1 H2 (g) DH 5 2368 kJ

How many moles of N are in 0.203 g of N2O?

An atom has a charge of +1 in its nucleus. Which statement must be true in order for this atom to have no net charge? A. The one positive proton has no influence on the overall charge of the atom. B.