calculate the number of grams of Na2CO3 in order to sythesize 0.500 g CaCo3

What is the velocity of an electron with the de Broglie wavelenghth of .406 nm? What is the Kinetic energy of an electron traveling at that velocity?

How many milliliters of 0.130 are needed to completely neutralize 54.0 mL of 0.109 M Ba(OH)2 solution?

1.one mole of oxygen gas has a mass of______g. a.16 b.6.022x10^23 c.32.0 d.8 e. none of the above 2.how many moles of pb are in 4.71x10^21 pb atoms? a. 2.84x10^45 b/6.022x10^23 c.207.2 d.0.00782 e.none 3. what is the mass of 3.09x10^24 atoms of sulfur in grams? a.9.64x10^22...

What is the balanced equation and the net ionic equation when sodium sulfite and hydrobromic acid combine?

A calorimeter contains 22.0 of water at 15.0. When 2.10 of (a substance with a molar mass of 75.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 30.0. Calculate the enthalpy change, , for this reaction per mole of . Assume that the specific...

Pure nitrobenzene boils at 210.88 C and freezes at 5.70 C. It has a boiling point elevation constant of 5.24 and a freezing point depression constant of 7.00, both expressed in units of C and molality. A solution of an unknown solute dissolved in nitrobenzene boils at 212.74 C. At what...

Nh3(aq) conducts an electric current only weakly. the same is true for HC2H3O2(aq). when these solutions are mixed, however, the resulting solution is a good conductor.

A 1.12 g sample of a molecular compound is dissolved in 98 g of tetrachloromethane (carbon tetrachloride). The normal boiling point of the solution is 61.51 C, the normal boiling point of CCl4 is 61.2 C. The boiling point constant for CCl4 is 4.95 K kg/mol. What is the molar mass of the...

A 25.6 g gram sample of impure potassium nitrate (KNO3) was heated to complete decomposition according to the equation: 2KNO3(s) --> 2KNO2(s) + O2(g) After the reaction was complete, the solid residue, consisting of KNO2 and the original impurities, had a mass of 23.5 g. Assuming...