1 peseta coin from Spain was dropped into a graduated cylinder containing 20.00
ID: 1068628 • Letter: 1
Question
1 peseta coin from Spain was dropped into a graduated cylinder containing 20.00 mL of water. The volume of the water increased to 20.37 mL. The coin has a mass of 0.99 grams. What is the identity of the metal used for the Spanish 1 peseta coins? aluminum (density of aluminum = 2.7 g/mL) zinc (density of zinc = 7.1 g/mL) copper (density of copper = 9.0 g/mL) silver (density of silver = 10.0 g/mL) Salt A and Salt B were dissolved separately in 100 mL beakers of water. The water temperatures were measured to give the following data: Salt A initial water temp 25.1 degree C. final water temp. 30.2 degree C Salt B initial water temp 25.1 degree C, final water temp. 20.0 degree C Which of the following statements best describes this data? Dissolving both Salt A and Salt B is exothermic. Dissolving both Salt A and Salt B is endothermic. Dissolving Salt A is exothermic, dissolving Salt B is endothermic. Dissolving Salt A is endothermic. dissolving Salt B is exothermic. What is the molecular shape of CCI_4 as predicted by VSEPR theory? Linear trigonal planar bent tetrahedral Shown below is the combustion of ethanol. Which of the following coefficients balance the reaction? _C_2H_6O + _O_2 rightarrow _CO_2 + _H_2O 1, 3, 2, 3 1, 2, 2, 2 1, 7, 2, 6 2, 7, 4, 6 What is the formula of a hydrate of CuSO_4 middot xH_2O, if when a sample of it is heated to dryness, it yields 1.60 g of anhydrous CuSO_4 (molar mass = 160. g/mol) and loses 0.90 g of water (molar mass = 18.0 g/mol)? CuSO_4 middot H_2O CuSO_4 middot 2H_2O CuSO_4 middot 4H_2O CuSO_4 middot 5H_2OExplanation / Answer
Solution:
Mass of Coin = 0.99 grams
Initial volume of water = 20 mL
Final volume after inserting coin = 20.37 mL
Volume increased = 20.37 - 20 = 0.37 mL
Therefore density of the metal = Mass/Volume = 0.99/0.37 = 2.7 g/mL
Metal is Aluminium with density 2.7 g/mL
Answer is option A.
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