<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>
-Observation
-analysis
- test salinity
-test temperature
Answer:
Sr has highest boiling point at standard pressure
Explanation:
Comparison of boiling points for these given elements require two factors namely- (1) atomic mass and (2) valency
Higher the atomic mass of an element, higher will be its boiling point. Because, with increase in atomic mass, van der waal forces between atoms increase. So more energy is required to boil an element by disrupting this interatomic force.
Higher the valency of an element, higher will be its boiling point. This is due to increase in bonding energy.
Here, Sr has higest atomic mass as well as it is bivalent. So Sr has highest boiling point.