We use prefixes in ionic compounds Don't use numeric prefixes like mono, di, tri, etc. when naming ionic compounds - they are used only to denote covalent molecular compounds.
Answer:
C. 
Explanation:
Hello there!
In this case, according to the given chemical reaction, it turns out possible to realize there is one sulfur atom on each side of the chemical equation but two hydrogen atoms on the left and one on the right, which means the latter must be balanced in agreement to the law of conservation of mass.
In such a way, by setting a 2 on H⁺, the reaction will be balanced:

Now, we count the transfer electrons for sulfur from -2 to 0 as 2e⁻ on the right, which will match with the option C.

Regards!
From the periodic table:
mass of hydrogen = 1 grams
mass of oxygen = 16 grams
mass of carbon = 12 grams
This means that:
mass of one mole of aspirin = 9(12) + 8(1) + 4(16) = 180 grams
number of moles can be calculated using the following rule:
number of moles = mass / molar mass
number of moles = 0.4 / 180 = 2.223 x 10^-3 moles
Answer:
carbon monoxide, CO, can be thought of as having two ordinary covalent bonds between the carbon and the oxygen plus a coordinate bond using a lone pair on the oxygen atom
Explanation:
NEUTRONS = MASS NUMBER - ATOMIC NUMBER
NEUTRONS = 31 - 15
NEUTRONS = 16