Determine the mass of 40.0moles of Na2co3
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Explanation:
Na has a mass number of 23, so 2 is 46. C is 12, and oxygen is 16, so 3 is 48. 46+12+48=106 so 1 mole of Na2CO3 is 106g. 106x40=4240 so 40 moles of Na2CO3 is 4240g
Hg has a mass number of 200.6, S has a mass number of 32.1. 1 mole of HgS has a mass of 232.7g. (1/232.7)x168=0.72 so you have 0.72 moles of HgS
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