Concept explainers
Practice ProblemATTEMPT
Perform the following arithmetic operations, and report the result to the proper number of significant figures:
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Chemistry
- Be sure to answer all parts. Carry out the following operations as if they were calculations of experimental results and express each answer in standard notation with the correct number of significant figures and with the correct units. Enter both the answer and the units in the answer field. (a) 7.2129 m + 0.6 m + 4.33 m (b) 3.70 g-4.0933 g (c) 4.51 cm x 5.9233 cmarrow_forwardIf liquid bromine has density = 3.12 g/mL, how many Br2 molecules are present in a 1.0-mL sample of pure liquid bromine? (A) 3.8 x 1021 (B) 7.5 x 1021 (C) 1.2 x 1022 (D) 2.4 x 1022arrow_forwardThe SI unit for energy is the joule (J), which is equal to the kineticenergy possessed by a 2.00-kg mass moving at 1.00 m/s. Convertthis velocity to mph (1 mi = 1.609 km).(a) 4.47 × 10–7 mph (b) 5.79 × 106 mph (c) 5.79 mph (d) 0.0373 mph (e) 2.24 mpharrow_forward
- Express the results of the following multiplications and divisions to the proper number of significant figures. All of the numbers are measured quantities. (a) 129.587 × 32.33 = 4.7791 (b) 3.21 × 5.793 10566.9 (c) 3.584 × 1029 (d) (5.247 × 10'3) × (1.3 × 10-17) =arrow_forwardAn aluminum plate has a diameter of 25.0 cm and weighs 335 g. If the density of aluminum is 2.70 g/cm3, what is the thickness of the plate? (A) 0.632 mm (B) 2.53 mm (C) 3.16 mm (D) 1.58 mmarrow_forwardcarrow_forward
- Be sure to answer all parts. (a) Calculate the number of oxygen molecules and the number of oxygen atoms in 39.5 g of O2. oxygen molecules = × 10 oxygen atoms = × 10 Enter your answers in scientific notation. (b) Calculate the mass of 9.17 ×1014 SO3 molecules. × 10 g Enter your answer in scientific notation.arrow_forwardsniparrow_forwardCurrent Attempt in Progress A gold bullion dealer advertised a bar of pure gold for sale. The gold bar had a mass of 3320 g and measured 4.37 cm x 4.54 cm x 6.02 cm. Use this information to determine if the bar was pure gold. (a) The volume of the bar is cm and the mass of the bar is 3320 g, therefore, the density of the bar is equal to g/cm. (b) Was the bar pure gold? O yes Exit session hparrow_forward
- Copper:(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 unitarrow_forwardWhich quantity in each of the following pairs is larger? (a) 5.63 * 106 cm or 6.02 * 101 km(b) 46µs or 3.2 * 10-2 ms(c) 200,098 g or 17 * 101 kgarrow_forward(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.arrow_forward
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