How many hydrogen atoms are in 1.0 g of C_2H_4? 6.2 times 10^-2 2.1 times 10^22

Question

How many hydrogen atoms are in 1.0 g of C_2H_4? 6.2 times 10^-2 2.1 times 10^22 atoms 4.3 times 10^22 atoms 8.6 times 10^22 atoms For $.50/kg, one can purchase either KNO_2 or NaNO_2, as a source of nitrate ion. Which choice and justification is most reasonable? NaNO_3, because it has a weaker ionic bond. KNO_3 because it will supply more nitrate per kg. NaNo_3, because it will supply more nitrate per kg. It does not matter which salt is purchased because both provide l mole of nitrate per mole of salt. What is the molar mass of Cu(NO_3)? 203.57 g middot mol^-1 187.57 g middot mol^-1 173.55 g middot mol^-1 125.56 g middot mol^-1 3 Cu(NO_2)_2 and 6 Ag 2 Cu(NO_3)_2 and 4 Ag 1 Cu, 2 Cu(NO_3)_2 and 4 Ag 2 AgNO_2 2 Cu. 1 Cu. 1 Cu(NO_3)_2 and 2 Ag What is the theoretical yield of Fe produced from the reaction of 2.0 mol Fe_2O_3 and 4.5 mol CO? Fe_2O_3 (s) + 3CO(g) rightarrow 3CO_2(s) + 2Fe(1) 3.0 mol 4.0 mol 4.5 mol 6.8 mol If and react to from, which set of reactants would produce 10 molecules with no excess reactants? 5 and 5 10 and 5 10 and 10 20 and 5

Explanation / Answer

The answers are the following

16. D

28.05 g butene has 6.023x1023 x 4 of hydrogen

1g - (6.023x1023 x 4)/28 = 8.6x1022 atoms

17. C: NaNO3 has lower molecular mass than KNO3

18. B (63.55+28+96) = 187.55 g/mol

19. D

20.C

21. D

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