Gold has a molar (atomic) mass of 197 g/mol. consider a 2.47 g sample of pure gold vapor. (a) calculate the number of moles of gold present

Which of the following is not true? A - Hydrogen contains only one electron and the spectrum gives a large number of lines B - There is only one type of energy transition in molecules which are electronic C - The emission spectrum can be used to

A decrease in pressure has the greatest effect on a solution that contains ... ?

A chemist adds 345.0 mL of a 0.520 mol/L of a barium chlorate solution to a reaction flask. Calculate the mass in grams of barium chlorate the chemist has added to the flask. Round your answer to significant digits.

Why do different isotopes of an element generally have the same physical and chemical properties?

analysis of a 12.04g sample of liquid compound compoed of carbon, hydrogen and nitrogen showed it to contain 7.34g carbon, 1.85g hydrogen and 2.85g nitrogrn. what is the percent composition of this compound?

14. Two or more substances that are together but do not combine to form a new, pure substance.

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution

Balance the following equation with the smallest whole number coefficients. Choose the answer that is the sum of the coefficients in the balanced equation. Do not forget coefficients of "one". RbOH + H3PO4 → Rb3PO4 + H2O

What is the temperature of 100 liter container having 1 mole of an ideal gas at a pressure of 20 kilopascals

5.2*10^26 molecules of ch4 in volume