When light travels from air into water, it slows down, causing it to change direction slightly
D Group A is soluble, and Group B is insoluble
Answer:
0.25 mole of NO2 contains 0.25 mole 'N'
one mole contains 6.023 x 10 ^23 atoms
0.25 mole II------------------------------>?
= 0.25 x 6.023 x10^23 = 1.5 x 10^23 atoms
Explanation:
<span>5.824x10^22 atoms of cobalt are in 5.699 grams of cobalt.
First, determine the number of moles of cobalt you have by dividing the mass of cobalt by the atomic weight of cobalt. So
Atomic weight cobalt = 58.933195
Mole cobalt = 5.699 g / 58.933195 g/mol = 0.096702716 mol
Now to determine the number of atoms, multiply by Avogadro's number. So
0.096702716 * 6.0221409x10^23 = 5.823574x10^22
Rounding to 4 significant figures, gives 5.824x10^22</span>