Answer Happy

1 How many kilograms is 8.8lbs? 2 A length of 150 cm is how many inches? 3 The molar mass of H₂SO4 is closest to A 150g B 50g C 25g D 125g E 75g F 100g 4 What is the total number of moles of ethanol in 115 grams of ethanol, C₂H₂OH? A 2.5 B 3.0 C 1.5 D 1.0 E 0.75 F 0.4 G 46 5 What is the total number of atoms in 3.0 moles of Copper, Cu? A 1,8 x 1024 B6 x 1023 C 29 D 63.6 E 81 F 3x 10²3 G 1.8 x 10²3 H 4 x 10²4 6 What is the total mass of 3 x 10²3 atoms of Helium (He) gas? A 4.0g B 8.0g C 6.0g D 3.5 g E 3.0g F 0.5g G 2,0 g 7 300K equals. A 573°C B 27°F C -27°C D-573°C E 0°C F 273°F G 27°C 8 Which temperature below best represents the freezing point of water? A 373K B 100°F C 100K D 273K E 0°F F-450°F G 37°C H.OK 9 How are two isotopes of the same neutral element similar? and 10 What are the relative sizes of an electron, proton, and neutron? 11 Which element has an electron configuration of 152 252 2P6 352 3P3 Fill in the underlined spaces. For the species name-fill in either neutral atom, cation, or anion Species #neutrons net charge species name #electrons #protons 12 V 13 Fe 14 V² 15 0²- 16 1.5 moles Argon, Ar= grams of Argon 17 1.5 moles Argon, Ar = number of atoms of Argon, Ar 18 69 grams Sodium, Na is moles sodium, Na

19 1.5 X 102 atoms of Sodium, Nas moles Na — 20 3X1023 atoms of Argon, Ar= grams Ar 21 1.8X1024 atoms of Ar gas at STP = liters Ar at STP 22 How many moles of ammonium carbonate are in a 192g sample of (NH4)2CO3 (s)?_ 23 The mass of 1/3 (one third) moles of tricalcium phosphate, Cas(PO4)2 is closest to A 103g B 0.001g C 2x 10"g D 310g E 450g F 160g G 18x10g H0.33g I 1.8 x 10g 24 The molarity of a solution prepared by dissolving 120 grams NaOH in a total volume of 3 liters of aqueous solution is closest to: A 1.0M B 2.0M CO.5M D 3.0M E 0.33M F80M G 20M H 4.0M 25 You are given two identical balloons both balloons are at STP. Balloon A contains exactly one mole of Neon, Ne gas; Balloon B contains exactly one mole Radon, Rn gas. Which of the statements below are true? (If there is more than one correct answer, you must circle all the correct answers to receive credit) A The temperature of balloon A is greater than the temperature of balloon B B Balloon B has a greater mass than balloon A C The pressure inside Balloon A is greater than in Balloon B D The temperature of both balloons are the same. E If both balloons have a tiny pinhole, the gas in Balloon B will effuse slower than the gas in Balloon A F Both balloons have an approximate volume of 22.4 liters G Only balloon B has an approximate volume of 22.4 liters H Balloon A contains more atoms than balloon B Extra Credit I (5 points) Imagine you are standing on a porch facing the street on the seventh floor of a building - about 80 feet above the ground. There is a long glass straw going from the porch (where you are standing) all the way down into an open bottle of water that is on the ground in front of the building. Clearly explain, using scientific terms, whether or not it would be possible to drink water through the glass straw from the open bottle that is sitting on the ground.