Answer:
Explanation:
To convert from grams to atoms:
- Convert grams to moles
- Convert moles to grams
1. <u>Convert grams to moles</u>
First, find the molar mass of cobalt using the Periodic Table of Elements.
- Cobalt (Co): 58.93319 g/mol
Next, use this mass as a ratio or fraction.
Multiply the mass of the given sample (345 grams) by this ratio.
Flip the fraction so the grams of Cobalt will cancel each other out when multiplying.
2. <u>Convert moles to atoms</u>
Use Avogadro's Number, which tells us the number of units (in this case atoms) in 1 mole.
Use this number as a ratio or fraction.
Multiply this ratio by the number of moles we found.
The moles of Cobalt will cancel.
3.<u>Round</u>
The original measurement of 345 has 3 significant figures (3, 4, and 5). We must round to 3 sig figs, which is the hundredth place for this measurement.
The 5 in the thousandth place tells us to round the 2 to a 3.
There are about <u>3.53*10²⁴ atoms of cobalt in 345 grams.</u>
Answer: Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A mixture is composed of different types of atoms or molecules that are not chemically bonded.
Explanation:
That would be the exosphere. The reason it feels cold, despite high temperatures, is due to lower air density.
Hope it helps!
Answer:
HCl(aq) + KOH(aq) ⇒ KCl(aq) + H₂O(l)
Explanation:
Hydrochloric acid is an acid because it releases H⁺ in an aqueous solution.
Potassium hydroxide is a base because it releases OH⁻ in an aqueous solution.
When an acid reacts with a base they form a salt and water. This is a neutralization reaction. The neutralization reaction between hydrochloric acid and potassium hydroxide is:
HCl(aq) + KOH(aq) ⇒ KCl(aq) + H₂O(l)
Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).
I hope this helps you.
