26.how many atoms of oxygen are represented in 3ba(clo3)2?

a.3
b.6
c.9
d.18

27.how many atoms of oxygen are represented in 3fe(no3)2?

a.3
b.6
c.12
d.18

28.when the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of h2o?

fe (s) + h2o (g) fe3o4 (s) + h2 (g)
a.2
b.4
c.6
d.8

29.which chemical equation below is balanced correctly?

a.2h2o h2 + o2
b. ch4 + 3o2 co2 + 2h2o
c. al4c3 + 3h2o ch4 + 4al(oh)3
d. zn + 2hcl zncl2 + h2

30.when the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of hno3?
n2o5 + h2o hno3

a.1
b.2
c.4
d.5

31.how many atoms of hydrogen are represented in 2ch3ch2o?

a.5
b.6
c.7
d.10

32.how many moles of oxygen gas would be needed to react completely with 8 moles of lithium metal in the following reaction?
4li + o2 2li2o

a.1
b.3
c.2
d.6

33.when 4.5 mol al react with 11.5 mol hcl, what is the limiting reactant, and how many moles of h2 can be formed?
2al + 6hcl → 2alcl3 + 3h2

a. al is the limiting reactant; 4.5 mol h2 can be formed
b. hcl is the limiting reactant; 3.8 mol h2 can be formed
c. al is the limiting reactant; 6.8 mol h2 can be formed
d. hcl is the limiting reactant; 5.8 mol h2 can be formed

34.if 38.7 grams of lithium chlorate decomposes, how many grams of oxygen gas can be produced?
2liclo3 → 2licl + 3o2

a.41.1 g o2
b.20.6 g o2
c.9.13 g o2
d.6.85 g o2

35.for the reaction shown, 38.25 grams of silicon is combined with 14.33 grams of nitrogen gas. how many grams of silicon nitride can be formed if nitrogen is the limiting reactant?
3si + 2n2 si3n4

a.17.94 g
b.21.23 g
c.35.88 g
d.63.69 g

36.if 62.4 grams of white phosphorus react with 136.2 grams of chlorine, how many grams of phosphorus trichloride can be formed?
p4 + 6cl2 4pcl3

a.137 g
b.176 g
c.263 g
d.277 g

37.which of the following is true of physical properties?

a. physical properties include properties like mass, color, and flammability.
b. physical properties cannot be observed without changing the identity of the material.
c. physical properties include properties like density, melting point, and ductility.
d. physical properties describe the potential for the material to undergo a reaction.

38.what coefficients must be added to balance the following equation?
+ so4 na2so4 + h2o

a.2, 1, 1, 1
b.3, 1, 1, 3
c.2, 1, 1, 2
d.4, 2, 2, 1

39.which of the following chemical equations violates the law of conservation of mass?

a. k2so4 + 2ca(no3)2 2kno3 + 2caso4
b. ti + 2cl2 ticl4
c.2c2h2 + 5o2 4co2 + 2h2o
d. baso4 + 2naoh ba(oh)2 + na2so4

40.which of the following is a double replacement reaction?

a. k2s + cocl2 2kcl + cos
b. ca + 2h2o ca(oh)2 + h2
c. cao + h2o ca(oh)2
d.2kclo3 2kcl + 3o2

41.which of the following statements is true of combustion reactions?

a. hydrogen gas (h2) must be one of the reactants
b. water (h2o) is always a product
c. energy is released by the reaction
d. carbon monoxide (co2) is always produced

42.using the balanced equation below, how many moles of calcium chloride are needed to react completely with 4.3 moles of silver nitrate?
2agno3 + cacl2 2agcl + ca(no3)2

a.1.4 mol cacl2
b.2.2 mol cacl2
c.4.3 mol cacl2
d.8.6 mol cacl2

43.when 3.5 mol al react with 12.5 mol hcl, what is the limiting reactant and how many moles of h2 can be formed?
2 al + 6 hcl 2 alcl3 + 3 h2

a. al is the limiting reactant; 3.5 mol h2 can be formed
b. hcl is the limiting reactant; 3.2 mol h2 can be formed
c. al is the limiting reactant; 5.3 mol h2 can be formed
d. hcl is the limiting reactant; 6.3 mol h2 can be formed

44.how many moles of h2o can be formed when 4.5 moles of nh3 react with 3.2 moles of o2?
4nh3 + 5o2 4no + 6h2o

a.3.8 mol h2o
b.4.8 mol h2o
c.6.4 mol h2o
d.6.8 mol h2o

45.if the reaction of 3.50 moles of lithium with excess hydrofluoric acid was able to produce 1.32 mol h2, what is the precent yield of the reaction?
unbalanced equation: li + hf lif + h2

a.75.4%
b.37.7%
c.18.9%
d.13.3%