Answer:
a) 0.1783 mol
b) 1.07*10^23 atoms
Explanation:
Step 1: Data given
Mass of gold (Au) = 35.12 grams
Molar mass of gold (Au) = 196.97 g/mol
Number of Avogadro = 6.022 *10^23 /mol
Step 2: Calculate number of moles gold
Number of moles = Mass of gold / molar mass of golf
Number of moles = 35.12 grams / 196.97 g/mol
Number of moles = 0.1783 moles
Step 3: Calculate number of atoms of gold
Number of atoms = number of moles * Number of Avogadro
Number of atoms = 0.1783 * 6.022 *10^23/ mol
Number of atoms = 1.07*10^23 atoms
Answer:
Circle Any 3 Red Spheres
Explanation:
All of these atoms are Carbon (C), as diamond is a network solid composed entirely of Carbon. They are all the same.
Answer:
Explanation:
1. Convert decagrams to grams
2. Convert grams to decigrams
\
The carbon dioxide in the headspace above the liquid is at higher pressure than atmospheric pressure outside the can.
The gas is at a lower volume initially but suddenly has a larger volume available when the can is opened.
The change in pressure as the gas rapidly moves to become dispersed through its new volume causes the "whoosh" sound.
The gas law that applies is Boyle's law.
This above is the exact answer for edgunity
Explanation:
For multiplication or division, the rule is to count the number of significant figures in each number being multiplied or divided and then limit the significant figures in the answer to the lowest count.
a. 20.0 meters x 0012.65 meters
The numbers are;
20.0 (3 s.f) and 12.65 (4 s.f)
The multiplication gives; 253
Since 253 is already in 3 s.f, that's the answer.
b. 002.5 × 103 meters + 3.50 × 102 meters
The numbers are;
002.5 (2 s.f), 103 (3 s.f), 3.50 (3 s.f) and 102 (3 s.f)
002.5 × 103 = 257.5 = 260 (2 s.f)
3.50 × 102 = 357 = 360 (2 s.f)
260 + 360 = 620
