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What is the molar mass of the solid?

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  • If a sample of Co2(CO)8 is found to contain 2.69 · 10-5 mol of C atoms how many moles of Co atoms are present? Express your answer in scientific notation. How many Co atoms are present in 4.97 · 1022 Co[P(CH3)3]4 molecules? Express your answer in scientific notation. If a sample of C6H3(C(CH3)3)3 is found to contain 6.84 · 1019 C atoms how many moles of H atoms are present? Express your answer in scientific notation. If a sample of Li3N is found to contain 52.1 g of Li+ ions how many grams of Li3N formula units are present? If a sample of Ca(OH)2 is found to contain 6.61 · 1020 OH- ions how many moles of Ca2+ ions are present? Express your answer in scientific notation.

  • Answer:

    grams/ molar mass = moles I can't understand what "2.69 0 10-5" means, so I will use an example with the same cmpd: Co2(CO)8 has 2 parts Cobalt ( 2 x 58.9g/mol), has 8 parts C (8x12), and 8 parts O(8x16) This total number can give you the number of moles of each element: if there are 5 g of Co2(CO)8, then 5/ (MM from adding above) number of moles of Co2, so for every mole of C02(CO)8, you have 2 mole Cobalt. Hope this helps.

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grams/ molar mass = moles I can't understand what "2.69 0 10-5" means, so I will use an example with the same cmpd: Co2(CO)8 has 2 parts Cobalt ( 2 x 58.9g/mol), has 8 parts C (8x12), and 8 parts O(8x16) This total number can give you the number of moles of each element: if there are 5 g of Co2(CO)8, then 5/ (MM from adding above) number of moles of Co2, so for every mole of C02(CO)8, you have 2 mole Cobalt. Hope this helps.

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