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37. How many milliliters of 0.50 M HCl are required to neutralize 25.0 mL of 1.0 M NaOH?

32. A gas occupies 4.0 L at 1.0 atm. If pressure increases to 2.0 atm at constant temperature, what is the new volume?

54. What is the wavelength of light emitted when an electron in hydrogen falls from n = 3 to n = 2? (Rydberg constant R = 1.097×10⁷ m⁻¹)

10. The difference between empirical and molecular formulas is:

31. What is the molarity of a solution prepared by dissolving 58.5 g of NaCl (molar mass = 58.5 g/mol) in 2.0 L of water?

4. Significant figures are important because:

17. Electron configurations indicate:

3. Precision refers to:

11. Molarity is:

Given the following standard costs for direct materials and direct labor per unit of product:                       Direct materials          2 pounds@ $11 per pound                       Direct labor                 1.5 hours @ $18 per hourDuring the month, 1,400 units were produced and sold. Direct materials purchased and used were 3,000 pounds at a cost of $9.50 per pound, and 1,900 hours of direct labor were incurred at a wage rate of $21.00 per hour. The direct labor efficiency variance for the month is