Oxidation numbers
P4 (Oxidation number of P)
0
N2 + H2 🡢 N2H4
N2 + 2 H2 🡢 N2H4
How many molecules of O2 are needed when 38 atoms of S react?
2 S + 3 O2 🡢 2 SO3
57 molecules O2
What mass of H2O is produced by the combustion of 1.00 mol of CH4?
CH4 + 2 O2 🡢 CO2 + 2 H2O
36.0 g H2O
What type of reaction is this?
2 KClO3 → 2 KCl + 3 O2
What is Decomposition?
SO2 (Oxidation number of S)
+4
Al + O2 🡢 Al2O3
4 Al + 3 O2 🡢 2 Al2O3
How many moles of Ag are produced when 0.661 mol of Al are reacted?
Al + 3 Ag+ 🡢 Al3+ + 3 Ag
1.98 mol Ag
What mass of NaHCO3 is needed to produce 2.659 mol of CO2?
2 NaHCO3 🡢 Na2CO3 + H2O + CO2
322 g HgO
Which element is oxidized in this redox reaction?
2 Ni + 3 I2 🡢 2 NiI3
Nickel is oxidized
NO2- (Oxidation number of N)
+3
NaClO3 🡢 NaCl + O2
2 NaClO3 🡢 2 NaCl + 3 O2
How many molecules are present in 2.509 mol of H2S?
1.511 x 1024 molecules H2S
How many moles of Al can be produced from 10.87 g of Ag?
Al(NO3)3 + 3 Ag 🡢 Al + 3 AgNO3
0.0504 mol Al
How many moles are present in 54.6 mL of mercury if the density of mercury is 13.6 g/mL?
3.72 mol Hg
Li2O2 (Oxidation number of Li)
+1
C3H8 + O2 🡢 CO2 + H2O
C3H8 + O2 🡢 3 CO2 + 4 H2O
What is the mass of 0.311 mol of Xe?
40.8 g Xe
What mass of Fe is generated when 100.0 g of Al are reacted?
Fe2O3 + 2 Al 🡢 2 Fe + Al2O3
207.0 g Fe
A chemist combusts a 3.009 g sample of C5H12 and obtains 3.774 g of H2O. What is the theoretical yield?
4.509 g H2O
Ca(NO3)2 (Oxidation number of N)
+5
Mg(OH)2 + HNO3 🡢 Mg(NO3)2 + H2O
Mg(OH)2 + 2 HNO3 🡢 Mg(NO3)2 + 2 H2O
How many moles are present in 48.8 g of BaCO3?
0.247 mol BaCO3
What mass of PbSO4 is produced when 29.6 g of H2SO4 are reacted?
Pb + PbO2 + 2 H2SO4 🡢 2 PbSO4 + 2 H2O
91.5 g PbSO4
Acetylene (C2H2) is formed by reacting 7.08 g of C and 4.92 g of H2.
2 C + H2 🡢 C2H2
What is the limiting reagent?C is the limiting reagent