What is the total number of moles of solute in 250 milliliters of a 1.0 m solution of nacl? 1. 1.0 mole 2. 0.25 mole 3. 0.50 mole 4. 42 moles

0.25moles

Explanation:

number of moles = concentration × volume

number of moles = ?moles

concentration of solute = 1.0M = 1.0mol/L

volume = 250mL = 250 × 10⁻³L = 0.25L

n= 1 × 0.25 = 0.25moles

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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explanation: