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
Try looking this stuff on Google ITS GREAT!!
Answer: N5 + H4 and then do 13.5 * 17.8 then solve so 240.3 divided by 9
Your answer is 26.7 Pretty sure
Explanation: (study)
Well i suspect it to be water-- yes water btw the answers are 1B 2B 3D 4B 5B 100% Correct
If you look at the periodic table you’ll noticed a trend. Group one, sometimes called 1A, has hydrogen in it, it’s group (column) has a positive charge. The group (column) next to it Group 2 sometimes called 2A has twice the charge as group 1. Then you skip the transition metals, and then land on group (column) 13. These guys have a charge of +3 typically. Then you have group 14, sometimes called 4A, and it’s weird and it kind of breaks with this trend. Then you have group (column) 15 next to it, sometime called 5A, which now starts to count down in charge, it has a charge of -3.
And each group (column) after that countdown to zero charge, once you have zero charge you know that you’re in the noble gases.
So, nitrogen in group (column) 15, also know as column 5A. This column has for the most part a charge of -3.
Aluminum is in group (column) 13, they have a charge of +3 typically.
I hope that helps.
