A sample containing 223Ra (t1/2 = 11.4 days) has an activity of 5.20×105 Bq. 1st attempt...
A sample containing 223Ra (t1/2 = 11.4 days) has an activity of 8.80×105 Bq. 1st attempt Part 1 (1 point) How many atoms of 223Ra are present? Part 2 (1 point)Feedback How many moles of 223Ra are present?
A sample containing 223Ra (t1/2 = 11.4 days) has an activity of 5.30×105 Bq. How many atoms of 223Ra are present? How many moles of 223Ra are present?
A sample containing 223Ra (t1/2 = 11.4 days) has an activity of 2.10×105 Bq. How many atoms of 223Ra are present?
this is the first question its just my second attempt a See page 935 08 Question (2 points) A sample containing 223Ra (t12 11.4 days) has an activity of 6.60x105 Bq. 2nd attempt Part 1 (1 pt) See Periodic Table See Hint How many atoms of 223Ra are present? 12 atoms x 10 1.3 Part 2 (1 pt) How many moles of 223Ra are present? x 10-2 moles 2.15
Find the activity of a sample containing 4.52 1014 iodine-131 nuclei (T1/2 = 8.0 days).
Cesium-131 is a short-lived radioisotope (t1/2 = 9.70 days) used to treat prostate cancer. How much therapeutic strength does a cesium-131 source lose over 20.0 days? Express your answer as a percentage of the strength the source had at the beginning of the first day. 01 Question (point) a See page 978 1st attempt hid See Periodic Table See Hint Cesium-131 is a short-lived radioisotope (t1/2 9.70 days) used to treat prostate cancer. How much therapeutic strength does a cesium-131...
One millimole of Ni(NO3)2 dissolves in 230.0 mL of a solution that is 0.400 M in ammonia. The formation constant of Ni(NH3)62+ is 5.5×108. 1st attempt Part 1 (1 point)See HintSee Periodic Table What is the initial concentration of Ni(NO3)2 in the solution? Part 2 (1 point) What is the equilibrium concentration of Ni2+(aq ) in the solution?
2 Question (1 point) See page Aluminum, silicon, and oxygen form minerals known as aluminosilicates. How many moles of aluminum are in: 1st attempt Part 1 (0.3 point) See Periodic Table 1.65 moles of pyrophyllite, AlSi,O10(OH)2 mol Al Part 2 (0.3 point) mol Al Part 2 (0.3 point) 4.60 moles of mica, KAI:SizO10(OH)2 moles Al Part 3 (0.3 point) 1.40 moles of albite, NaAlSi Og moles Al
07 Question (1 point) e See page 690 (1 point) V 1st attempt i See Periodic Table D See Hint A solution is made by dissolving 0.06000 moles of Ba(OH)2 in enough water to make 770.0 mL of solution. What is the pH of the resulting solution?
1st attempt Part 1 (1 pt) * Feedback bi See Periodic Table Complete and balance the chemical equation for this combustion reaction. Do not add states of matter. x x. "He → S. 2C4H10+1302 —— 10H20+8C02 Part 2 (1 pt) X Feedback ♡ See Hint Determine how many grams of CO2 are produced by burning 2.43 g of C4H10. g carbon dioxide