Answer:
CH2O
Explanation:
the empirical formula of a compound is determined by obtaining the moles of each element and then divided each element by the lowest value. represents the simplest ratio in which atoms that form a chemical compound.
for the molecular formula C2H4O2; its empirical formula would be:
moles C: 2/2 = 1
moles H: 4/2 = 2
moles O: 2/2 = 1
⇒ empirical formula: CH2O
The value of HEPES is 7.5.
Now, to prepare a HEPES buffer at 8.5:
A proper amount of HEPES is mixed with distilled water (sterilised) to avoid any contamination. After that check the pH with the help of pH scale or pH meter.
Now, identify the pH and if pH is higher than 8.5, then a particular amount of hydrochloric acid is added to it drop by drop to get the HEPES buffer at 8.5.
If pH is lower than 8.5, then a specific amount of base such as sodium hydroxide is added to it drop by drop to get HEPES buffer at 8.5.
At last, when 8.5 pH is obtained, the buffer solution is filtered and placed in the container of the glass and then covered by aluminium foil.
<u>Given:</u>
Fe2O3 + 3CO → Fe + 3CO2
<u>To determine:</u>
The elements that are not balanced in the above equation
<u>Explanation:</u>
A chemical equation is said to be balanced if the number of atoms on the reactants is equal to that of the product side.
Reactant Product
Fe = 2 atoms Fe = 1 atom
O = 6 atoms O = 6 atoms
C = 3 atoms C = 3 atoms
<u>Ans:</u> Therefore, Fe is not balanced as there is 1 atom less on the product side
Balanced equation: Fe2O3 + 3CO → 2Fe + 3CO2