Molecules consisted only of hydrogen and carbon elements are called hydrocarbons, or organic molecules since they are found in living things.
Depending on their structure and the chemical bonds between the elements, they can be divided into three groups :
1) saturated ( which have only single bonds between the hydrogen and carbon atoms eg. CH3-CH3 )
2)non-saturated ( which have two or three bonds between the carbon and hydrogen atoms eg. CH2=CH2)
3) aromatic (having the aromatic ring )
Answer:
135g Na2CO3
Explanation:
I'm going to assume you mean Molality which is mol solute/kg solvent
Molarity would be mol soute/ L solution
we know we have 155g of water which is .155 kg
essentially we have the equation:
mol/kg = 8.20
we substitute .155 in for kg and get:
mol/.155 = 8.20
Solving this gives mol = 1.271
now we must convert to grams using the molar mass
Molar mass Na2CO3 = 106G/mol
so to cancel moles we multiply:
1.271mol x 106g/mol
= 135g
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 %
Pure substances can be categorize into "Elements" and "Compounds"
Hope this helps!
Answer:
D. Ionic compound
Explanation:
Just based on my opinion
Correct me if I'm wrong tnx:<