Answer:
491.4 g
Explanation:
This a stoichiometry question, let me repeat the reaction equation here;
2 Na + Cl2 --> 2 NaCl
The balanced reaction equation must serve as a guide in solving any problem on stoichiometry.
From the balanced reaction equation;
1 mole of chlorine gas yields 2 moles of sodium chloride
Therefore, 4.2 moles of chlorine gas yields 4.2 ×2/1 = 8.4 moles of sodium chloride.
Molar mass of sodium chloride= 23 + 35.5= 58.5 gmol-1
Mass of sodium chloride formed= number of moles × molar mass
Mass of sodium chloride formed= 8.4 × 58.5= 491.4 g
Explanation:
It is known that for
, ppm present in 1
are as follows.
1
= 0.494 ppm
So, 150
= ![\frac{150}{1000} mg/m^{3}](https://tex.z-dn.net/?f=%5Cfrac%7B150%7D%7B1000%7D%20mg%2Fm%5E%7B3%7D)
= 0.15 ![mg/m^{3}](https://tex.z-dn.net/?f=mg%2Fm%5E%7B3%7D)
Therefore, calculate the equivalent concentration in ppm as follows.
![0.15 \times 0.494 ppm](https://tex.z-dn.net/?f=0.15%20%5Ctimes%200.494%20ppm)
= 0.074 ppm
Thus, we can conclude that the equivalent concentration in ppm at STP is 0.074 ppm.
Answer:
3.6g
Explanation:
2 moles of water gives 1 mole of oxygen
2(h2o)=1(o2)
2(molar mass of h2o)=1(molar mass of oxygen molecule)
2(18)=1(16×2)
36=32
3.6=x
cross multiply
3.6×32=36× x
115.2=36x
x=115.2÷36
x=3.6g
Answer:
The three main subatomic particles that form an atom are protons, neutrons, and electrons.
Explanation: