When fracking liquid waste is left in pools on the surface, _ can evaporate into the air and contribute to pollution

The answer is "toxic chemicals".

Explanation:

Hydraulic fracture uses compounds such as sand to prevent fractures from closing, chemical additives, and several hundred chemical products, some very toxic and carcinogenic, that perform the function of preventing gas and oil from becoming contaminated. They are also used to prevent corrosion. By depositing fracking liquid waste in the pools, the most volatile products tend to evaporate contributing to air pollution. Some of the elements contained in this wastewater are selenium, radio, and lead.

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When fracking liquid waste is left in pools on the surface, Toxic Waste or Toxic Chemicals can evaporate into the air and contribute to pollution. A new study shows that these spills have left surface waters in the area carrying radium, selenium, thallium, lead, and other toxic chemicals that can continue for years at unsafe levels. 

The answer is

mass = 489g

The explanation:

1- iron (III) sulfate chemical formula is

Fe2(SO4)3

2- the molar mass of Fe2(SO4)3 is

= 55.8*2 + 32*3 + (16*4)*3 =399.9 g/mol

3- To get the mass we can use this formula:

Mass = moles * molar mass

= 1.223 mol * 399.9 g/mol

= 489 g

∴ the mass in grams of 1.223 mol iron(iii) sulfate = 489g