1. Enter your answer in the provided box.
Calculate the moles of O atoms in 18.9 g of Sr(NO3)2.
mol O atoms
2. Be sure to answer all parts.
Calculate the mass in kilograms of 8.9 ×1018 molecules of NO2.
___ ×10 kg ____NO2
Enter your answer in scientific notation.
3. Be sure to answer all parts.
Calculate the number of H− ions in 8.95 g of MgH2.
__ ×___ 10___H− ions
Enter your answer in scientific notation.
4. Be sure to answer all parts.
Calculate the mass in milligrams of 7.62 ×1021 formula units of Bi(NO3)3 · 5H2O. Enter your answer in scientific notation.
___×__10 mg Bi(NO3)3 5H2O.
5.
Be sure to answer all parts.
Cisplatin (right), or Platinol®, is a powerful drug used in the treatment of certain cancers. Calculate...
(a) the moles of compound in 281.6 g of cisplatin.
______mol
(b) the number of hydrogen atoms in 0.279 mol of cisplatin.
___×10___ atoms H
(Enter your answer in scientific notation.)
6.
Enter your answer in the provided box.
Hemoglobin, a protein in red blood cells, ca
ies O2 from the lungs to the body's cells. Iron (as fe
ous ion,
Fe2+) makes up 0.33 mass % of hemoglobin. If the molar mass of hemoglobin is 6.8
×104g/mol, how many Fe2+ ions are in one molecule?
____ Fe2+ ions
7. Be sure to answer all parts.
Write a balanced equation for the following by inserting the co
ect coefficients (if a coefficient = 1, enter "1" in the provided box).
___ As4S6(s) +__ O2(g)→__As4O6(s) +___ SO2(g)
8. Be sure to answer all parts.Bismuth oxide reacts with ca
on to form bismuth metal:
Bi2O3(s) + 3C(s) → 2Bi(s) + 3CO(g)
When 302 g of Bi2O3reacts with excess ca
on,
(a) how many moles of Bi form?
____mol Bi
(b) how many grams of CO form?
____ g CO
9. Be sure to answer all parts.
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen:
4KNO3(s) → 2K2O(s) + 2N2(g) + 5O2(g)
To produce 59.4 kg of O2, how many
(a) moles of KNO3must be heated?
____mol
(b) grams of KNO3 must be heated?
____g
10.
Enter your answer in the provided box.
An intermediate step in the industrial production of nitric acid involves the reaction of ammonia with oxygen gas to form nitrogen monoxide and water. How many grams of nitrogen monoxide can form by the reaction of 514 g of ammonia and 905 g of oxygen?
_____ g nitrogen monoxide
11.
Be sure to answer all parts.
Hydrogen gas has been suggested as a clean fuel because it produces only water vapor when it burns. If the reaction has a 79.7% yield, what mass of hydrogen forms 976 kg of water?
___×10___g
Enter your answer in scientific notation.
12. Enter your answer in the provided box.
Calculate the volume of 7.75 mol of
omoform (CHBr3; d = 2.89 g/mL).
____mL