Please help. Determine the number of moles of PbCl2 in 112 grams of PbCl2.

Select one:
a. 0.40 moles
b. 0.25 moles
c. 1.15 moles
d. 3.10 moles

Determine the number of moles of Na2SO4 in 213 grams of Na2SO4.

Select one:
a. 2.75 moles
b. 3.10 moles
c. 0.33 moles
d. 1.50 moles

Growing crops in places where major pests don't live using beneficial insects to eat harmful insects using a rat trap instead of a rodenticide developing drought-resistant tomato plants using beneficial insects or natural oils to repel pests planting a different crop every year to fake out the pests keeping food covered to deter ants and rodents developing bean plants with a resistance to fungus picking caterpillars off tomato plants cultivation practice biological control cultural control genetic resistance natural chemicals