Answer:
The number of atoms in 20 grams of Pa-234 is 5.14 ×10²² atoms
Explanation:
Given that the molar mass of Pa-234 (protactinium) is 234.04331, we have
The number of moles of protactinium in 20 grams of Pa-234, we have
Number of moles = Mass/(Molar mass) = 20/234.04331 = 0.0855 moles
One mole of Pa-234 contains 6.02×10²³ atoms, therefore, we have;
0.0855 moles of Pa-234 contains 0.0855× 6.02×10²³ = 5.14 ×10²² atoms
Therefore, the number of atoms in 20 grams of Pa-234 = 5.14 ×10²² atoms.
1.5 L KNO3 solution* (2.0 mol KNO3/ 1 L KNO3 solution)= 3.0 mol KNO3.
The correct answer is (3) 3.0 mol.
Hope this would help~
Answer:Air Pollution is when gas and fuel is released into the air and damages the environment. The Answer out of your answers would be C.
Explanation: