Avg. Atomic Mass
Rubidium has two common isotopes. 72.2% of the time it has a mass of 85.005 amu and 27.8% of the time it has a mass of 87.35 amu. What is the average atomic mass of rubidium?
What is 85.65 amu?
Calculate the mass percent of oxygen in C6H12O6
What is 53.29%?
How many grams of aluminum hydroxide are obtained from 10.5 grams of aluminum sulfide? Al2S3 + H2O -----> Al(OH)3 + H2S
What is 10.9 g Al(OH)3?
When 7.50 grams of hydrosulfuric acid reacts with 12.75 grams of sulfur dioxide, sulfur and water are produced. How many grams of excess reactant remain after the reaction?
What is 5.70g SO2?
Covert 0.00369 m to nm
*sig figs!
What is ... 3.69 x 10^6 ?
X” has five major isotopes, which are listed below along with their abundances. What is the element? (8.00%) (45.95269)
(7.30% ) (46.951764)
(73.80%) ( 47.947947)
(5.50%) (48.947841)
(5.40%) (49.944792)
What is 47.88 amu?
Calculate the mass percent of phosphorus in calcium phosphate
What is 19.97%?
How many oxygen atoms are present in 622.0 grams of aluminum sulfate?
What is 1.314 x10^25?
The molar mass of a compound is 92 g/mol. Analysis of the compound shows that there are 0.608 grams of nitrogen and 1.388 grams of oxygen. What is the molecular formula of this compound?
What is N2O4?
What is the compound for Gallium Acetate?
What is ... Ga(C2H3O2)3 ?
copper is vaporized and injected into a mass spectrometer, the results are as follows: 69.09% of the time it has a mass of 62.93 amu and 30.91% of the time it has a mass of 64.93 amu. Use this data to determine the average atomic mass of natural copper.
What is 63.55 amu?
Calculate the mass percent of nitrogen in chromium (III) nitrate.
What is 17.73%?
How many moles are there in 1.5 X 1026 molecules of BF3?
What is 250 moles?
nitrogen reacts with hydrogen to produce ammonia (NH3). Calculate the theoretical yield of ammonia if 3000. grams of nitrogen react with 1500.0 grams of hydrogen.
What is 3648g NH3?
Convert 0.00300 dm^3 to kL
*sig figs!
An element consists of 1.40% of an isotope with a mass of 203.973 amu, 24.10% of an isotope with mass 205.9745 amu, 22.10% of an isotope with mass 206.9759 amu, and 52.40% of an isotope with mass 207.9766 amu. Calculate the average atomic mass and identify the element.
What is 207.2 amu?
Calculate the mass percent of nitrogen in ammonium sulfate.
What is 21.2%?
How many formula units are present in a sample of 250.0 grams of chromium (III) nitrate?
What is 6.325 x10^23?
When 2.85 grams of oxygen reacts with excess ammonia (NH3), 1.36 grams of nitrogen monoxide are produced. Water is another product. Calculate the theoretical yield (in grams) of nitrogen monoxide and the percent yield. NH3 + O2 ------🡪 NO + H2O (this is NOT balanced yet)
What is TY= 2.14g PY=63.6%?
Who discovered the Law of Definite Proportions?
Who is ... Joseph-Louis Proust ?
Uranium has three common isotopes. If the abundance of 234U is 0.01%, the abundance of 235U is 0.71% and the abundance of 238U is 99.28%, what is the average atomic mass of uranium?
What is 238.03 amu?
Calculate the mass percent of oxygen in copper (II) hydroxide
Calculate the theoretical yield of potassium hydroxide produced if 25.00 grams of potassium reacts with water. Hydrogen gas is also produced.
What is 35.87g KOH?
A compound is known to contain only carbon, hydrogen, and oxygen. Combustion of 0.255 grams of this compound produces 0.561 grams of carbon dioxide and 0.306 grams of water. The molar mass is 120 g/mol. Determine the empirical and molecular formula of this compound.
What is EF= C3H8O MF=C6H16O2?
What are Isotopes?