Use the atomic masses on the Periodic Table that I gave to you, not the numbers
ID: 1038189 • Letter: U
Question
Use the atomic masses on the Periodic Table that I gave to you, not the numbers on the alphabetical list on the back (e.g. H is 1.008 g/mol) 1. How many atoms are in 35.05 moles of krypton gas? A) 5.819 x 1023 atoms Kr Kr D) 2.111 x 1025 atoms Kr Kr B) 5.189 x 103 atoms C) 2.1 x 1023 atoms Kr E) 5.189 x 104 atoms AB) none of these 2. How many moles of Ne are 6.58 x 1025 atoms Ne? A) 409 mole Ne C) 410. mole Ne D) 1.09 x 1025 mole Ne B) 110. mole Ne E) 109 mole Ne AB) none of these 3. How many atoms are in 8.56 moles of hydrogen gas? A) 5.15 x 1024 atoms H B) 5.16 x 10 atomsH C) 1.04 x 1025 atoms H D) 2.58 x 104 atoms H 5.57 x 1024 atoms H E) AB) none of these 4. How many atoms are in 5.82 moles of ozone gas? A) 3.51 x 104 atoms O B) 3.51 x 105 atoms o C) 7.01 x 1024 atoms O D) 7.01 x 1025 atoms O E) 1.05 x 1025 atoms AB) none of these 5. What is the mass of 8.530 moles of iodine crystals? B) 1.082 x 103 g A) 2.165 x 103 g 12 C) 3.247 x 103 g I2 D) 1080 g I2 E) 541.2 gI AB) none of these 6. 606.5 g of potassium contains how many moles of potassium atoms? A) 31.02 moles K B) 2.371 x 10 moles C) 1.186 x 104 moles K D) 7.756 moles K E) 15.51 moles AB) none of theseExplanation / Answer
1)
use:
number of atoms = number of moles * Avogadro’s number
number of atoms = 35.05 * 6.022*10^23 atoms
number of atoms = 2.111*10^25 atoms
Answer: D
2)
use:
number of mol = number of atoms / Avogadro’s number
number of mol = 6.58*10^25 / 6.022*10^23 mol
number of mol = 1.09*10^2 mol
Answer: E
3)
one mole of H2 contains 2 mole of H
use:
number of moles of H = 2 * number of moles of H2
= 2 * 8.56
= 17.12
use:
number of atoms = number of moles * Avogadro’s number
number of atoms = 17.12 * 6.022*10^23 atoms
number of atoms = 1.04*10^25 atoms
Answer: C
Only 1 question at a time please
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.