B <span>For most substances, the solid state is more dense than the liquid state.</span>
Answer : The correct option is, (D) 
Explanation : Given,
Concentration of 
= 3 M
Concentration of 
= 1 M
Concentration of 
= 2 M
The given balanced equilibrium reaction is,
The expression for equilibrium constant for this reaction will be,
![K_{eq}=\frac{[NH_3]^2}{[N_2][H_2]^3}](https://tex.z-dn.net/?f=K_%7Beq%7D%3D%5Cfrac%7B%5BNH_3%5D%5E2%7D%7B%5BN_2%5D%5BH_2%5D%5E3%7D)
Now put all the given values in this expression, we get the value of 
Therefore, the value of for the given reaction is, 1.125
<h3><u>Answer;</u></h3>
3.4 kJ
<h3><u>Explanation</u>;</h3>
Taking the mass of water as 10.0 g
Moles of water = Mass /molar mass
Moles of water in 10.0 g;
= 10g H2O x 1mol/18g
=0.56mol
But, 1 mole of water = 6.01 kJ
Hence;
6.01kJ/1mol H2O= x kJ/.56mol,
x = <u>3.4kJ</u>
Answer:
0.156mol
Explanation:
Number of moles of a substance can be calculated from its mass by dividing its mass by molar mass i.e.
Number of moles (n) = mass/molar mass
Molar mass of PbCl4 is as follows, where Pb = 207.2g/mol, Cl = 35.5g/lol
PbCl4 = 207.2 + 35.5(4)
= 207.2 + 142
= 349.2g/mol
Using: mole = mass/molar mass
mole = 54.32 grams ÷ 349.2g/mol
mole = 0.1555
mole = 0.156mol
Answer:
1.They are reliable.
2.They dont vary from person to person
