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A certain type of nail weighs 0.50 lb per dozen. How many nails are contained
in 3.5 lb of these nails?
(a) 84
(b) 21
(c) 0.58
(d) 12
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- (A)18.7g NO2 express your answer in moles to three significant figures. (B)1.88 kgCO2 express your answer in moles to three significant figures. (C) 48.8 g KNO3 express your answer in moles to three significant figures. (D) 116.2 kgNa2SO4 express your answer in moles to four significant figures.The radius of an atom of krypton (Kr) is about 1.9 Å. (a) Express this distance in nanometers (nm). nm Express this distance in picometers (pm). pm (b) How many krypton (Kr) atoms would have to be lined up to span 1.0 mm? atoms (c) If the atom is assumed to be a sphere, what is the volume in cm³ of a single krypton (Kr) atom? cm³6.Express your answers to at least 5 significant figures. The mass of one mole of boron is 10.811 g. (a) What is the mass in u of one boron atom? answer was 10.81 (b) What is the mass in kg of one boron atom? ___x10^_____
- An object is determined to have a mass of 0.01080 g. How manysignificant figures are there in this measurement?(a) 2 (b) 3 (c) 4 (d) 5 (e) 62) The Kc value for the following equilibrium at 500°C is 49. H2(g) + I2(g) = 2HI(g) If 1.50 moles of H2 and 1.50 moles of I2 are introduced into a 2.00 L flask at 500°C, how many moles of HI are present at equilibrium?The U.S. quarter has a mass of 5.67 g and is approximately1.55 mm thick. (a) How many quarters would have to bestacked to reach 575 ft, the height of the Washington Monument?(b) How much would this stack weigh? (c) Howmuch money would this stack contain? (
- An empty vial weighs 55.32 g. (a) If the vial weighs 185.56 gwhen filled with liquid mercury (d=13.53 g/cm³), what is itsvolume? (b) How much would the vial weigh if it were filledwith water (d=0.997 g/cm³ at 25C)?10. Which of the following does not match the others? (A) 67.2 3.88 1000 100 (B) (C) 1s 2s 2p (D) ofelectronsCopper:(a) Suppose you have a cube of copper metal that is 0.236 cm on a side with a mass of0.1206 g. If you know that each copper atom (radius = 128 pm) has a mass of 1.055 ×10–22 g (you will learn in Chapter 2 how to find the mass of one atom), how manyatoms are there in this cube? What fraction of the cube is filled with atoms? (Orconversely, how much of the lattice is empty space?) Why is there “empty” space in thelattice?(b) Now look at the smallest, repeating unit of the crystal lattice of copper.Knowing that an edge of this cube is 361.47 pm and the density of copper is 8.960g/cm3, calculate the number of copper atoms in this smallest, repeating unit
- 35. An effervescent tablet has the follow- ing formula: Acetaminophen Calcium Carbonate 325 mg 280 mg 900 mg Citric Acid Potassium Bicarbonate 300 mg Sodium Bicarbonate 465 mg (a) Calculate the total weight, in grams, of the ingredients in each tablet. (b) How many tablets could be made with a supply of 5 kg of acetamin- ophen? hlePlatinum, Pt, is one of the rarest of the metals. Worldwideannual production is only about 130 tons. Platinum has a densityof 21.4 g>cm3. If thieves were to steal platinum from a bank usinga small truck with a maximum payload capacity of 900 lb, howmany 1 L bars of the metal could they take?(a) 19 bars (b) 2 bars (c) 42 bars (d) 1 bar (e) 47 barsWhat is the average mass (in grams) of a single carbon dioxide molecule? (a) 3.8 × 10-26 g (b) 7.31 × 10 23 (c) 2.65 × 1025 (d) 44.01 g 8,