The chemical equation representing the reaction between baking soda and acetic acid :
According to the Law of conservation of mass, the overall mass is conserved in a chemical reaction. That is total mass of reactants is equal to the mass of the products.
Given here Mass of Baking soda = 15 g
Mass of acetic acid = 10 g
Total mass of the reactants = 15 g +10 g = 25 g
After the reaction, total mass of products = 23 g
This difference in masses must be because one of product carbon dioxide is a gas, which is lost and hence the mass of products is lower than the mass of reactants. Therefore, the mass is conserved in this reaction.
Answer:
The molecular formula of the phosphorus is P4
Explanation:
<u>Step 1:</u> Data given
Density of phosphorus vapor at 310 °C and 775 mmHg = 2.64g /L
<u>Step 2: </u>Calculate the molecular weight
We assume phosphorus to be an ideal gas
So p*V = n*R*T
⇒ with p = the pressure of phosphorus = 775 mmHg
⇒ with V = the Volume
⇒ with n = the number of moles = mass/molecular weight
⇒ with R = ideal gas constant = 0.08206 L*atm/K*mol
⇒ with T = the absolute temperature
p*V = m/MW *R*T
MW = mRT/PV
⇒ Since the volume is unknown but can be written as density = mass/volume
MW = dRT/P
MW = (2.64g/L * 0.08206 L*atm/K*mol * 583 Kelvin)/1.0197 atm
MW = 123.86 g/mol
<u>Step 3</u>: Calculate molecular formula of phosphorus
The relative atomic mass of phosphorus = 30.97 u
123.86 / 30.97 = 4
The molecular formula of the phosphorus is P4
[H+] in first brand:
4.5 = -log([H+])
[H+] = 10^(-4.5)
[H+] in second brand:
5 = -log[H+]
[H+] = 10^(-5)
Difference = 10^(-4.5) - 10^(-5)
= 2.2 x 10⁻⁵
The answer is A.
Answer:
+5
Explanation:
it hs 5 more protons thant electrons, so it has a positive charge of 5
