The density of magnesium is 1.74 g/cm'. What is the mas x 4.50 cm? (a) 29.4...
A compound of phosphorus and oxygen contains 43.64 % by mass phosphorous. The empirical formula is (a) PO (6) PO₂ (c) P₂0 (d) PO (1) P₃0. Assuming ideal gas behavior, the density, in g/L of N,O(g) at 1.53 atm and 45.2 °C is (b) 1.76 g/L (c) 16.4 g/L (a) 18.2 g/L (e) none of the above. (d) 2.58 g/L When the measured quantity 7.43 g/cm is converted to kg/m the answer is (a) 7.43 x10 kg/m² (b) 7.43 x...
8. How many molecules are contained in 0.0525 g of HF? (a) 1.58 x 10 (e) none of the above. (b) 2.30 x 10 (c) 3.16 x102 (d) 4.83 x 10 9. Given the data 3B+ 4D-A+SP AH 1856 kJ/mole AH 164 kJ/mole the AH for the reaction A +7/2F->3E+4D is (a) -1364 kJ/mole)2 (b) 2.020 x 10 kJ/mole (c) -2.02 x 10' kJ/mole (d) -2348 k/mole (e) none of the above 10. What volume, in ml, of a 0425...
1. A solution is made by dissolving 3.875 g of magnesium chloride in enough water to make 200.0 mL of solution. Calculate the molarity of magnesium chloride solution. A. 0.04070 M B. 2.03510-4 M C. 0.2035 M D. 0.3242 M E. 8.14010-3 M 2. How many grams of Na2SO4 (MM 142.04 g/mol) are in 250. mL of a solution that has a concentration of 0.115 M? A. 4.08 g B. 2.02 g C. 6.25 g D. 1.14 g E. 3.07...
What is the density of a section of bone if a 25.3 cm) sample has a mass of 27.8 g? a) 110 g/cm? b) 1.1 g/cm ) 1 g/ cm d 1.1000 g/cm? e) 0.110 x 10 m Round-up 0.066454 to two significant figures. Use the scientific notation If required, a) 0.0666 b) 6.66 x 10-2 C) 06.6 x 102 d 0.07 e) 7 x 10
37) What is the volume occupied by 4.00 g of O2 gas at STP? A) 2.8 mL B) 89.6 L C) 89.6 mL D) 5.6 L E) 2.8 L 38) Which of the followin g expressions is the correct equilibrium-constant expression for the following reaction? CO2 (s)+ 2H2 (g)CH3OH (g) A) [CH30H] (H2]2 CH3OH] co2 CH3OH] CO2H2)2 [CO2l(H212 [CH3OH ICO2l[H2] (CH3OH B) C) D) E) 39) The pH of a 0.25 M aqueous solution of hydrofluoric acid, HF, at 25.0...
10.) Consider the following reaction: CH_(g) + 2 H2S(g) = CS2(g) + 4 H2(g) A reaction mixture initially contains 0.800 M CH4 and 0.950 M H2S. If the equilibrium concentration of H, is 0.440 M, find the equilibrium constant (Kc) for the reaction. A) 0.234 B) 0.0381 C) 2.93 D) 10.2 E) 0.0112 F) none of these
cannot figure out. please assist. Thank you In the figure, a wire loop of dimensions L 43.4 cm and w 27.5 cm lies in a magnetic field . what are the (a) magnitude and (b) direction (clockwise or counterclockwise-or "none" if = 0) of the emf induced in the loop if B-(4.30 × 10-2 T/m)yk ? what are (c), and (d) the direction if B = (6.28 × 10-2 T/s)ti ? what are (e)s and (f) the direction if B...
Part C Iron has a density of 7.86 g/cm (1 cm = 1 mL). Calculate the volume (in dL) of a piece of iron having a mass of 4.25 kg . Note that the density is provided in different units of volume and mass than the desired units of volume (dL) and the given units of mass (kg). You will need to express the density in kg/dL (1 cm = 1 mL) before calculating the volume for the piece of...
a. 4.0 km b. 3.40 km c. 250 km d. 0.25 km e. none 12. Convert 375 pounds to kilograms. a. 826 kg b. 14.0 kg c. 170 kg d. 82 kg e. none 13. Express 12 km/L in mi/gal a. 7.0 mi/gal b. 28 mi/gal c. 31 mi/gal d. 73 mi/gal f. 32 mi/gal 14. How many minutes will it take for a car that is travelling 8.0 x 10 mi/h to travel 200 km? a. 93 min b....
24) What is the concentration of magnesium ions in a 0.125 M Mg 504 solution? A) 0.125 M B) 0.0625 M C) 0.375 M D) 0.250 M E) 0.160 M 25) What is the concentration of sodium ions in a 1.225 M Na, SO4 solution? 26) What is the concentration of FeCl3 in a solution prepared by dissolving 30.0 g of FeCl3 in enough water to make 275 mL of solution? A) 6.73 x 10-4 M B) 0.673 M C)...