17. 37.5 mL of a 0.250 M Na2CO3 solution is added to 46.5 mL of 0.120 M NaCl. What is the concentration (M) of sodium ion (Na⁺ ) in the final solution? (A) 0.15 M (B) 0.29 M (C) 0.58 M (D) 0.89 M (E) none of these.

7. Which of the following statements is correct? (A) An excited atom can return to its ground state by absorbing electromagnetic radiation (B) 1s orbital in He+ is larger (probability density is shifted outward) than the 1s orbital in H (C) Energy of electromagnetic radiation increases as its frequency decreases (D) The binding forces in a molecular solid include London dispersion forces (E) none of these

17. 37.5 mL of a 0.250 M Na₂CO₃ solution is added to 46.5 mL of 0.120 M NaCl. What is the concentration (M) of sodium ion (Na⁺ ) in the final solution?
(A) 0.15 M
(B) 0.29 M
(C) 0.58 M
(D) 0.89 M
(E) none of these.

相關試題

相關試卷