Question

plz answer all questions ASAP plz

A Hide Time Remaining A Question 6 of 20 5 Points For which of the following isotopes would it be unlikely to observe B decay? O ABN OB. 190 OC. 27 MB D. OF E. 200 Reset Selection

Answer 1

Question 6 of 20

Answer option A 13N

Explanation

Nuclei which n/p ratio is less than 1 donot go through B - decay.

Question 7 of 20

Answer 171 Os 76 (osmium)

Explanation

alpha particle are helium nucleus . When alpha particle emits atomic mass decreases by 4 and atomic number Z decreases by 2.

175Pt 78 -> 171 Os 76 + 4 He 2

Question 8 of 20

Given , half life phosphorus -32=14.3 days Aften i 288 ho Sample Ne left = 3.50 mg » T/2 = 0.693 d = 0.693 플 - tao.693 14.3 days days da o.ou85 NE = No et where, - No - initial concentration 288 No = Neelt No = 3.50 No : 3.50 0.048 0.586 No : 6.26 mg

criven, compound As(Ilmol k) 240.5 NO2 a Hi (kJ/mo) 33.2 9.2 Naou 304.2 For reaction, 2 NO2 2 Nou Ally = AMINOU 2 Ano Nor - (9.2 - 2X 33.2) = - 57.2 KJ /mol As = As Nou - 205 NO2 = 3o4.8 Quo. S slmola = 63.7 x 103 kl/molu = 0.0637 aflmolu Aco. OHI - A87 soso, -57.2 - 0.0637 x 29851/201k = -76.18 kJ/mol a Rounding off to significant figure, Answer: -76.2 kJ/mol k