A. the half-life for a first order reaction in 49 minutes. what is the rate constant? b. for a second order reaction, the half-life is 726 seconds. starting with a concentration of 0.600 m, how long will it take for the concentration to decrease to 0.150 m? c. the half-life for a first order reaction is 2768 years. starting with a concentration of 0.345 m, what will the concentration be after 11,072 years? d. the half-life for first order reaction a is 75 minutes. the half-life for a different first order reaction b is 322 minutes. which reaction has the faster rate? (a or b) which reaction has the larger rate constant, k? (a or b)

Idon’t know how to solve this question

Can someone me with questions 12 and 13 plz.

Ineed someone to see if my answers are correct! if any are wrong let me know what the correct answers would be and how to get that answer! 1. how many moles of sodium chloride are in 28 grams od nacl? a. 265 mole naclb. 856 mole naclc. 479 mole of nacld. 1.2 mole nacl < my choice2. 734 grams of lithium sulfate (li2so4) are dissolved to make 2500 ml of solution what is rhe molaratiy? a. 2.67 mb. 4.56 mc. 3.89 m < my choiced. 1.78 m3. how many grams of cacl2 would be dissolved in 3.0 l of a 0.50 m solution of cacl2? a. 250 g cacl2 b. 166.5 g cacl2c. 113.65 g cacl2d. 98 g cacl2 < my choice4. suppose you had 58.44 g of nacl and you dissolved it in exactly 2.00 liters. the molarity if the solution would be 0.5 mtrue < my choicefalse 5. i would need 22g of naoh to make a 3.0 m solution using 250 ml of solvent.true < my choicefalse6. identify the solute: you have a .0195 m solution made from using 6.5 g of solute and 3 l of solvent. identify the solute by solving for molar weight.a. the solute is nacl because the molar weight is 58.43 g/mol < my choiceb. the solute is h2so4 because the molar weight is 98.06 g/molc. the solute is cacl2 because the molar weight is 111.11 g/mol