Apiece of sodium metal reacts completely with water as follows: 2na(s) + 2h2o(l) ⟶ 2naoh(aq) + h2(g) the hydrogen gas generated is collected over water at 25.0°c. the volume of the gas is 246 ml measured at 1.00 atm. calculate the number of grams of sodium used in the reaction. (vapor pressure of water at 25°c = 0.0313 atm.)

What is the number of moles in 15.0 g ash3?

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

Calculate - analysis of compound composed of iron and oxygen yields 174.86 of fe and 75.14g of o. what is the empirical formula for this compound?