The theoretical yield and percent yield of hydrogen if 0.27 g of H2 collected is calculated as follows
write the reaction equation
that is Fe + Hcl = H2 + FeCl2
calculate moles of Fe = mass/molar mass = 8.85 g/56 g/mol =0.158 moles
by use mole ratio between Fe : H2 which is 1:1 the theoretical moles of hydrogen = 0.158moles
the theoretical mass is therefore = moles x molar mass
= 0.158 mol x2g/mol =0.316 grams
% mass = actual mass/ theoretical mass x 100
= 0.27/0.316 x100 = 85.4 %
Answer is
C. 2.07 M
For explanation
M1V1 = M2V2
M2 = (M1V1)/V2
M2 = (1.5M x 345ml) / 250 ml
:. M2 = 2.07 M
Answer:
Explanation:
Hello,
In this case, for dilution process, we can notice that the initial moles remain the same once the dilution is completed, therefore, both concentration and volume change considering:
In such a way for the given final volume, the resulting concentration is noticed to be:
This is supported by the fact that the higher the volume the lower the concentration.
Best regards.
The correct answer is C. Excess food with cause a population to grow.
Reaching the carrying capacity causes a population to stop growing. Disease and crowded conditions may even cause a population to decline, so those can be ruled out.