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: The molarity of the base solution is 0.22 M.
Explanation:
According to the neutralization law,
where,
= molarity of 
solution = 0.1994 M
= volume of solution = 38.87 ml
= molarity of 
solution = ?
= volume of solution = Final reading - Initial reading = 36.18 - 1.16 = 35.02 ml
= valency of = 1
= valency of = 1
Therefore, the molarity of the base solution is 0.22 M.
Answer:
Ca
Explanation:
Ionization energy decreases from top to bottom and increases from left to right on the periodic table
I think it is B the distance light travels from the sun to the earth
Answer:
The answer to your question is below
Explanation:
1.-
a) Look for the mass number of Gold in the periodic table
Mass number = 197 g
Use proportions to answer this question
197 g of gold ------------- 6.023 x 10 ²³ atoms
4.64 g of gold ---------- x
x = (4.64 x 6.023 x 10²³) / 197
x = 1.42 x 10²² atoms
2.- mass of 4.12 x 10²⁴ molecules of glucose
Molecular mass = (6 x 12) + (12 X 1) + (6 x 16)
= 72 + 12 + 96
= 180 g
180 g of glucose ------------------- 6.023 x 10 ²³ molecules
x ------------------- 4.12 x 10 ²⁴ molecules
x = (4.12 x 10²⁴ x 180) / 6.023 x 10²³
x = 1231.3 g of glucose
