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Answer:
1.40 moles.
Explanation:
The balanced chemical equation for the reaction of Phosphorus and Oxygen is as follows -

In Part A, the oxygen was taken in excess. So Phosphorus will be the limiting reagent.
Since, 2 moles of
is formed by 4 moles of 
So, for 1.8 moles of
amount of required moles of
=
In Part B, the phosphorus was taken in excess so oxygen will be the limiting reagent.
Since, 2 moles of
is formed by 5 moles of oxygen
So, for 1.40 moles of
moles of
required = 
Thus as of now we have 3.60 moles of
and 3.50 moles of
.
As in the reaction of formation of
, oxygen is the limiting reagent.
So the moles of
formed by the 3.50 moles of oxygen will be
=
= 1.40 moles.
Answer:
The mass of solid with density 14.2 g/cm3 and volume 350 cm3 is 4.97 Kg.
Explanation:
Formula for density is given below :



Insert the values in the formula

on cross multiplication :



1 g = 0.001 Kg

mass = 4.97 Kg
Note : Check the units of volume and density carefully
The Rutherford model was called the nuclear model because he decided on the atom to consist of both the nucleus, and the orbits of electrons, so he separated the nucleus from being combined with the whole atom