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this is the first question its just my second attempt a See page 935 08 Question...
A sample containing 223Ra (t1/2 = 11.4 days) has an activity of 5.20×105 Bq. 1st attempt Part 1 (1 point)See HintSee Periodic Table How many atoms of 223Ra are present? atoms Part 2 (1 point) How many moles of 223Ra are present? moles
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?
08 Question (1 point) How many unpaired electrons are there in each species below? See page 367 1st attempt Part 1 (0.5 point) I See Periodic Table See Hint P unpaired electrons Part 2 (0.5 point) p3-has unpaired electron(s) SUBMIT ANSWER < 08/17 >
08 Question (4points) See p Complete and balance the following neutralization reaction, name the products, and write the net ionic equation. 2nd attempt Part 1 (1 point) l See Periodic Table Se Complete and balance the reaction. х He (a 8 нв- (аg) + кон(а) See F (2 points) Part 2 SUBMIT 08/19 13 OF 19 QUESTIONS COMPLETED MacBook Air
06 Question (1 point) See page 351 2nd attempt See Periodic Table See Hint Although no currently known elements contain electrons in gorbitals, such elements may be synthesized someday. What is the minimum atomic number of an element whose ground-state atoms have an electron in a gorbital? > 1st attempt
penalty 04 Question (4 points) See page 289 A balloon is filled to a volume of 15.9L at a temperature of 27.1°C. If the pressure in the balloon is measured to be 2.20 atm, how many moles of gas are contained inside the balloon? 2nd attempt hi See Periodic Table See Hint
There is no attempt penalty 07 Question (2 points) a See page 443 1st attempt Feedback liul See Periodic Table See Hint A weather balloon with a volume of 171 L is launched at 20.0°C at sea level, where the atmospheric pressure is 1.00 atm. The balloon rises to an altitude of 2.00 x 104 m, where atmospheric pressure is 57.0 mmHg and the temperature is 210.0 K. What is the volume of the balloon at 2.00 x 104m? 1526.1...
Question (1 point) 2nd attempt Feedback It See Periodic Table O See Hint In a 8.00 M nitrous acid (HNO,) solution, calculate (H). Nitrous acid is a weak acid with K - 4,00 x 104 at 25°C. 1.789 x 10- M > 1st attempt
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