29) What is the stoichiometric coefficient for oxygen when thefollowing equation is balanced using the lowest whole-numbercoefficients? ________ C3H6O2(l) + ________ O2(g) →________ CO2(g)+ ________ H2O(l) A) 5 B) 7 C) 1 D) 3 29)

30) Which of the following underlined items is not an intensiveproperty? A) the melting point of iron metal B) the color of copperhydroxide C) the amount of gold. D) the density of argon 30)

31) Rubidium belongs to the ________ group of the periodictable. A) alkali metal B) alkaline earth metal C) halogen D) noblegas 31)

32) Chlorine belongs to the ________ group of the periodictable. A) alkali metal B) alkaline earth metal C) halogen D) noblegas 32)

33) An element has two naturally occurring isotopes. One has anabundance of 37.4% and an isotopic mass of 184.953 amu, and theother has an abundance of 62.6% and a mass of 186.956 amu. What isthe atomic weight of the element? A) 185.954 amu B) 186.956 amu C)185.702 amu D) 186.207 amu 33)

34) A piece of metal ore weighs 7.25 g. When a student places itinto a graduated cylinder containing water, the liquid level risesfrom 21.25 mL to 25.00 mL. What is the density of the ore? A) 1.93g/mL B) 3.21 g/mL C) 0.141 g/mL D) 0.281 g/mL 34)

4 35) How many protons (p) and neutrons (n) are in an atom of226 88 Ra? A) 138 p, 88 n B) 88 p, 226 n C) 226 p, 88 n D) 88 p,138 n 35)

36) 1.00 mole of O2 contains the same number of molecules as A)0.667 mole of O3. B) 1.00 mole of CH3CO2CH2Cl. C) 2.00 mole ofCH3CH2OCH2Br. D) All of these 36)

37) What is the number of moles of 5.00 × 10 22 molecules ofNaBr? A) 0.083 moles B) 1.0 moles C) 1.2046 moles D) 0.037 moles37)

) 39) Na2S is named A) sodium(II) sulfide. B) sodium disulfide.C) sodium sulfide. D) sodium sulfur. 39) 40) The factor 10-3corresponds to which prefix? A) centi B) deci C) deka D) milli40)

41) A sample of pure calcium fluoride with a mass of 15.0 gcontains 7.70 g of calcium. How much calcium is contained in 35.0 gof calcium fluoride? A) 18.0 g B) 15.0 g C) 1.99 g D) 7.70 g