The only part of a chemical equation you can change to balance it.
What are the coefficients?
100
1 mole of this element has a mass of 14.01g.
What is nitrogen?
100
The number of 'things' in a mole of something, also known as Avogadro's (avocado?!) number.
What is 6.02 x 10^23?
100
Based on the balanced equation
2Mg + O2 --> 2MgO
the number of moles of Mg needed to react with 1 mole of O2.
What is 2 mol Mg?
200
The element represented by the symbol Sb.
What is antimony?
200
The balanced equation for the reaction
CaH2 + H2O --> Ca(OH)2 + H2
What is CaH2 + 2H2O --> Ca(OH)2 + 2H2
200
The molar mass of the compound LiCl.
What is 42.39g?
200
The number of atoms of Mo in 6.2 moles of Mo.
What is 3.73 x 10^24 atoms Mo?
200
Based on the balanced equation
2Mg + O2 --> 2MgO
the mass in grams of MgO produced when 2.800 moles of Mg completely react.
What is 112.9 g MgO?
300
The name of the compound N4F8.
What is tetranitrogen octafluoride?
300
The balanced equation for the reaction
B2O3 + C --> B4C3 + CO2
What is 2B2O3 + 6C --> B4C3 + 3CO2?
300
The molar mass of the compound NH4Br.
What is 97.94g?
300
The mass in grams of 6.200 moles of Mo.
What is 594.8 g Mo?
300
Based on the balanced equation
3SiH4 + 4NH3 --> Si3N4 + 12H2
the mass in grams of Si3N4 produced when 12.5 grams of SiH4 completely react.
What is 18.2 g Si3N4?
400
The formula for the compound zinc phosphate.
What is Zn3(PO4)2?
400
The balanced equation for the reaction
MoS2 + O2 --> MoO3 + SO2
What is 2MoS2 + 7O2 --> 2MoO3 + 4SO2?
400
The molar mass of the compound ammonium sulfide.
What is 68.15g? (NH4)2S
400
The number of moles of sodium chloride in 50.00 g of sodium chloride.
What is 0.8556 mol NaCl?
400
Based on the balanced equation
3SiH4 + 4NH3 --> Si3N4 + 12H2
the mass in grams of H2 produced when 12500. milligrams of SiH4 are completely reacted.
What is 3.14 g H2?
500
The name of the compound Pb(CO3)2.
What is lead (IV) carbonate?
500
The balanced equation for the reaction of ammonia (NH3) burning in oxygen to produce nitrogen monoxide and water.
What is 4NH3 + 5O2 --> 4NO + 6H2O?
500
The molar mass of the compound copper (II) nitrate.
What is 187.57g? Cu(NO3)2
500
The number of molecules of aluminum oxide in 0.2157 kilograms of aluminum oxide.
What is 1.274 x 10^24 molecules Al2O3?
500
Based on the reaction of nitrogen monoxide and hydrogen to produce nitrogen and water, the mass in grams of nitrogen produced when 0.0125 kilograms of hydrogen completely react.