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Take Test: Chapter &: Hk 2x ps/assessment/take/Aaunchjsp?course assessment id-_132531,1&course; jd 11449 https://co ley QUESTION 1 sources What is the mass of 3 30 x 1023 atoms of silver, Ag? O 0.549 g O 258g O 59.1g 0 8579 O 197 g QUESTION 2 How many hydrogen molecules are in 2.75 L of H2 gas at STP? O 1.66 x 10* molecules 2.19 x 1023 molecules O490 x 10 molecules O 7.39 x 102 molecules O 9.77 x 1 molecules Click Save and Submit to save and submit. Click Save All Answers to save all answers. ère to search

Explanation / Answer

question 1:

The mass of 6.023*10^23 atoms of Ag = 107.8682 g

so the mass of 3.30*10^23 atoms of Ag

= 3.30*10^23 atoms of Ag *(107.8682 g /  6.023*10^23 atoms of Ag)

= 59.1 g

Therefore, the mass of 3.30*10^23 atoms of Ag

Question 2:

22.4 L of H2 = 1 mole

so 2.75 L of H2 = 0.123 mole of H2

1 mole of H2 contains 6.023*10^23 molecules so

0.123 mole of H2 will contain

= 0.123 mole of H2 *(6.023*10^23 molecules / 1 mole of H2 )

= 7.39*10^22 molecules of H2

Therefore, the number of molecules of H2 =  7.39*10^22

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