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
It’s the BOA not the dog or kangaroo
Answer:
1.18 V
Explanation:
The given cell is:
Half reactions for the given cell follows:
Oxidation half reaction:
Reduction half reaction:
Multiply Oxidation half reaction by 2 and Reduction half reaction by 3
Net reaction:
Oxidation reaction occurs at anode and reduction reaction occurs at cathode.
To calculate the
of the reaction, we use the equation:
Putting values in above equation, we get:
To calculate the EMF of the cell, we use the Nernst equation, which is:
where,
= electrode potential of the cell = ?V
= standard electrode potential of the cell = +1.21 V
n = number of electrons exchanged = 6
Putting values in above equation, we get:

Answer:
The impurity which is present in the solution of copper sulphate (CuSO4) is determined by the an instrument known as spectrophotometer.
Explanation:
Spectrophotometer is a device or an instrument which is used to determine the concentration of a chemical by measuring the detection of light intensity that is coming from the solution. If the solution of copper sulphate is checked through spectrophotometer, we can can determined or measure the amount of copper sulphate and the impurity in the solution.
Answer: 17 years
Explanation:
Expression for rate law for first order kinetics for radioactive substance is given by:

where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.


b) for 8900 g of the mass of the sample to reach 7700 grams


Thus it will take 17 years