I'm not 100% sure on this one, but I think it's C.
Sorry, I'm not really good with Chemistry.
Hope this helps :)
Answer: There are 
molecules 
gas are in 756.2 L.
Explanation:
It is known that 1 mole of any gas equals 22.4 L at STP. Hence, number of moles present in 756.2 L are calculated as follows.
According to mole concept, 1 mole of every substance contains 
molecules.
Therefore, molecules of S present in 33.76 moles are calculated as follows.
Thus, we can conclude that there are molecules gas are in 756.2 L.
Answer:
Mass of NaOH required= 60 g
Explanation:
Given data:
Mass of NaHCO₃ = 126 g
Mass of NaOH required = ?
Solution:
Chemical equation:
NaOH + CO₂ → NaHCO₃
Number of moles of NaHCO₃:
Number of moles = mass/ molar mass
Number of moles = 126 g/ 84 g/mol
Number of moles = 1.5 mol
Now we will compare the moles of NaHCO₃ and NaOH.
NaHCO₃ : NaOH
1 : 1
1.5 : 1.5
Mass of sodium hydroxide:
Mass = number of moles × molar mass
Mass = 1.5 mol × 40 g/mol
Mass = 60 g
Answer:
disulfur hexabromide
Explanation:
First, <u>identify the element names </u>using your periodic table.
"S" means sulfur. "Br" means bromine. The <u>second element drops the ending and adds "-ide"</u>.
S₂Br₆
sulfur bromide
Decide if the compound is <u>ionic or covalent</u>.
Since there are two non-metals, this is a covalent compound. So, will use Greek prefixes for the number of atoms. You can see the list below and find "2" and "6".
S₂Br₆
disulfur hexabromide
List of Greek number prefixes:
1 mono
2 di
3 tri
4 tetra
5 penta
6 hexa
7 hepta
8 octa
9 nona
10 deca
The name of S₂Br₆ is disulfur hexabromide.
