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20) - 26) Diamond is a pure form of the element carbon. If a 2 carat diamond has a mass of 0.396 g, how many carbon atoms are contained in this diamond? A) 2.38 x 1023 atoms B) 1.99 x 1023 atoms C) 1.99 x 1022 atoms D) 3.97 x 1022 atoms E) 6.58 x 10-25 atoms 27) 27) Dinitrogen monoxide, or laughing gas (N20), is used as a dental anesthetic and as an aerosol propellant. How many molecules of N20 are present in a 12.6 g sample of the compound? A) 1.72 x 1023 molecules B) 7.59 x 1024 molecules C) 5.14 x 1023 molecules D) 1.289 molecules E) 3.34 x 1026 molecules 28) - 28) When the equation below is balanced with the lowest possible whole number coefficients, what is the sum of the coefficients? Ca(s) + HCI(g) - CaCl2(s) + H2(g) A) 5 B) 10 C) 4 D) 2 E) 8 29) 29) Lithium oxide can be produced by the reaction shown below. If a manufacturing company wants to make 25.0 g of Li20, what mass of Li is necessary? [Molar masses: Li, 6.94 g/mol; 0, 16.00 g/mol] 4Li(s) + O2(g) → 2Li20(3) A) 12.5 g Li B) 2.903 g Li C) 23.2 g Li D) 11.6 g Li E) 0.0861 g Li 30) – 30) Magnesium hydroxide, Mg(OH)2, as "Milk of Magnesia" can be used to neutralize excess stomach acid, represented by HCl(aq) according to the chemical equation below. Mg(OH)2(s) + 2HCl(aq) → MgCl2(aq) + 2H 2017 When 5.00 g of HCl are combined with an excess of Mg(OH)2, what mass of MgCl2 can be produced? [Molar masses: H, 1.01 g/mol; 0, 16.00 g/mol; Mg, 24.31 g/mol; CI, 35.45 g/mol) A) 2.50 g B) 0.957 g C) 13.1 g D) 70.5 g E)6.53 g
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