1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
victus00 [196]
3 years ago
8

The combustion of 135 mg of a hydrocarbon produces 440 mg of CO2 and 135 mg H2O. The molar mass of the hydrocarbon is 270 g/mol.

Determine the molecular formula of this compound.
Chemistry
1 answer:
NeX [460]3 years ago
5 0

Answer:

Molecular formula = C20H30

Explanation:

NB 440mg = 0.44g, 135mg= 0.135g

From the question, moles of CO2= 0.44/44= 0.01mol

Since 1 mol of CO2 contains 1mol of C, it implies mol of C = 0.01

Also from the question, moles of H2O = 0.135/18= 0.0075mole

Since 1 mol of H2O contains 2mol of H, it implies mol of H = 0.0075×2= 0.015 mol of H

To get the empirical formula, divide by smallest number of mole

Mol of C = 0.01/0.01=1

Mol of H = 0.015/0.01= 1.5

Multiply both by 2 to obtain a whole number

Mol of C =1×2 = 2

Mol of H= 1.5×2 = 3

Empirical formula= C2H3

[C2H3] not = 270

[ (2×12) + 3]n = 270

27n = 270

n=10

Molecular formula= [C2H3]10= C20H30

You might be interested in
When the pressure that a gas exerts on a sealed container changes from 22.5 psi to ? psi, the temperature changes from 110 degre
natta225 [31]
Using Gay-Lussac's Law, pressure is proportional to (absolute) temperature in Kelvin. We first convert the temperature values to Kelvin: 110 C = 383.15 K, while 65 C = 338.15 K.
P1/T1 = P2/T2
22.5/383.15 = P2/338.15
P2 = 19.9 psi
8 0
3 years ago
What is the percentage composition when 10g of magnesium combines with 4g of nitrogen?
Ivanshal [37]
The %  composition   when 10g of magnesium combine   with  4g of   nitrogen  is  71.43%   magnesium   and  28.57 %  nitrogen

               calculation

%
  composition  =  mass  of an element  / total mass  x100
mass  of magnesium = 10 g
mass of nitrogen  =  4g

calculate  the  total  mass  used

=  10g of  Magnesium  + 4 g of  nitrogen = 14 grams

%   composition for  magnesium  is therefore  =  10/14  x100 = 71.43 %

%  
composition  for  nitrogen  is therefore = 4 /14  x100  =   28.57 %
7 0
2 years ago
Need help answering
svp [43]

Answer:

Your answer would be E

Explanation:

4 0
2 years ago
A new stable element with an atomic number of 120 and an atomic mass of 246 is created in a particle accelerator. Enough of this
deff fn [24]

Answer:

Be,Mg,Ra etc

Explanation:

It should be palced in group 2A because as it reacts with chlorine in ratio of 1:2 . It's valancy is 2 and is metal as it react with non metal donating two electrons .

one more thing it fits there orderly

3 0
3 years ago
Calculate the mass of 5.3 moles of chloric acid (hcl03)
Minchanka [31]
If I did the math right .. it would be 84.46grams
5 0
2 years ago
Other questions:
  • Can a tank of oxygen gas ever be half empty? pls explain
    12·2 answers
  • What color would the cyanidin indicator turn in an acidic solution?
    8·2 answers
  • Is this enough money for this question
    7·2 answers
  • Nitrogen dioxide gas is produced by the reaction of nitrogen monoxide gas and oxygen gas .
    10·1 answer
  • NEED ANSWER ASAP<br> When a solid goes straight to a gas this is know as _____________.
    12·2 answers
  • How do atmic raii vary in group and peroid. why?​
    13·1 answer
  • When an element'’s mass in grams equals the element’'s atomic mass, how many moles of atoms are contained in that amount of the
    5·1 answer
  • One third of the united states carbon consumption is used to operate what
    8·2 answers
  • What experimental evidence led Rutherford to conclude the following: (a) The nucleus of the atom contains most of the atomic mas
    6·1 answer
  • What is the pressure of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheri pressure is 767 m
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!