Question

ID Problems 46) A piece of silver (Ag) metal weighing 194.3 g is placed in a graduated cylinder containing 242.0 mL of water. The volume of water now reads 260.5 mL. From these data calculate the density of silver 47) The following procedure was used to determine the volume of a flask. The flask was weighed dry and then filled with water. If the masses of the empty flask and filled flask were 56.12 g and 87.39 g, respectively, and the density of water is 0.9976 /, calculate the volume of the flask in cm 48) A typical aspirin tablet contains 5.00 grains of pure aspirin analgesic compound. The rest of the tablet is starch. How many aspirin tablets can be made from 50.0 g of pure aspirin? [Use: 1.00 g 15.4 grains] 49) A patient weighs 146 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25.0 mg of drug per mL of solution. What volume of the drug should the patient receive?[I pound 454 g] 50) If one atom of carbon-14 weighs 14.0 atomic mass units and one atomic mass unit is equal to 1.66 x 10 grams, what is the mass of 25 atoms of carbon-14 in grams? 51) Air has an average density of 0.001226 gmL. What volume of air would have a mass of 1.0 lb? 454 g-1 pound 52) The "normal" lead content in human blood is about 0.40 part per million (that is, 0.40 g of lead per million grams of blood). A value of 0.80 part per million (ppm) is considered to be dangerous. How many grams of lead are contained in 6.0 x 10 g of blood (the amount in an average adult) if the lead content is 0.62 ppm? 53) How many pounds are represented by 764.6 mg?[ pound-454 g 54) You are given a piece of wood that is maple, teak, or oak. The piece of wood has a volume of 1.00 x 10 cm and a mass of 98 g. The densities of m teak, and oak are as follows: Wood Ma Teak Oak Density (g/cm 0.70 0.98 What is the identity of the piece of wood? 55) Express the answers to the following calculations in scientific notation: (a) 145.75(2.3 x 10-) (b) 79,500 (2.5 x 10) (c) (7.0× 10-3)-(8.0× 10-4) (d) (1.0 x 10 x (9.9x 10) 56) Carry out the following operations as if they were calculations of experimental results, and express each answer in the correct units with the correct number of significant figures: (a) 7.310 km+5.70 km b) (3.26 x 10mg)-(788 x 10mg) (c) (4.02 × 10° dm) + (7.74 x 10' dm) (d) (7.8 m-0.34 m/1.15 s+0.82 s

Answer 1

346- iven mass of silver 194-3 Incial readirg 242 mL Fínal reacin^ - 260-5 mlL DLvol. o i Here volurne of siwer s Fthal - Intial readin e 260.5 242 mL e 18.5 ml Also, Densty Mass Volume Densty 194.3 9 18-5 mL

94 ven, mass of flled flask 87. 39 mass o em lask ะ ร์6-12 Mass of hater 8739 56-12 3. 27 d Densiky of kater 0.9976 gc»2 ersity乙mass Volume 31.2 Densi 0-9976 31 345 cm3 .

Q48 1 d 50 5.4 qrauns 770 낍rans い巳 0.3246 øh» pure Qsp inin in one tablet For 50 qm o f purt aspirin i No. of tablet- i x 50 9m 0.3246 gm 54.03 54 tablet

049.G eighPerson 146 pounds Drug dosage 45 m per kg soluton 25 my drug /mL of solulion 1, pound 454 d oight of person146 146 x 454 g 66.3 kq hJsight of person 146 pourds Amouht of drugs to be given e 66.3* 45 mg/kg - 298 3.5 mg. Herc, 1 ml of solution contains 25 mq ol druq. "Therefore, volume oe Soluhon 2983,5 25T e19 34 mL

950.1 Given. 1 alom of C bweight 14 ama 1 arnu - -66024 grams Therefore, mass of 25 atomsこ25x14 I. 66 x 1024 grars 5.81 X 1o-22 Q51n. verage deniy of air0.1226 gfm mass of air - I Ub 454 Density: mass-〉 Valume Moss Density Volurme こ454 g 3-7 X 105mL 0. 001226 4/ml

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