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
slava [35]
3 years ago
6

When a 3.00 grams sample of a compound containing only c, h, and o was completely burned, 1.17 grams of h2o and 2.87 grams of co

2 were formed. what is the simplest formula of the compound?
Chemistry
1 answer:
SVEN [57.7K]3 years ago
3 0

Answer:- CH_2O_2

Solution:- From given masses of carbon dioxide and water we could calculate the moles that helps to calculate the moles of C and H.

Molar mass of carbon dioxide = 44 gram per mol

molar mass of water = 18.02 gram per mol

From given info, combustion of compound gives 1.17 grams of water and 2.87 grams of carbon dioxide. Let's calculate the moles of these:

1.17gH_2O(\frac{1mol}{18.02g})

= 0.0649molH_2O

Similarly, 2.87gCO_2(\frac{1mol}{44g})

= 0.0652molCO_2

One mol of water has two moles of H. So, the moles of H would be two times the moles of water as calculated above.

So, moles of H = 2* 0.0649 = 0.1298 mol

One mol of carbon dioxide contains one mol of C. So, the moles of C would be equal to the moles of carbon dioxide calculated above.

moles of C = 0.0652 mol

Let's convert the moles of H and C to grams so that we could calculate the amount of oxygen present in the sample as:

grams of H in sample = 1.008 x 0.1298 = 0.1308 g

grams of C in sample = 12*0.0652 = 0.7824 g

If we subtract the sum of the masses of C and H from sample mass then it would give as the mass of oxygen since the sample has only C, H and O.

mass of O in sample = 3.00g - (0.1308 g + 0.7824 g)

= 3.00 g - 0.9132 g

= 2.0868 g

Let's convert these grams of oxygen to moles on dividing by it's atomic mass as:

2.0868gO(\frac{1mol}{15.999g})

= 0.130 mol O

Now, we have the moles of all the three atoms and we know that an empirical formula is the simplest whole number ratio of the moles of atoms. So, let's calculate the ratio. For this, we divide the moles of each by the least one of them.Looking at the moles, the least value is for carbon. So, let's divide the moles of each by the moles of C as:

C = \frac{0.0652}{0.0652}  = 1

H = \frac{0.1298}{0.0652}  = 2

O = \frac{0.130}{0.0652}  = 2

The ratio of C, H and O is 1:2:2. So, the simplest formula of the compound is CH_2O_2 .



You might be interested in
Is MgCo3 = MgO + CO2 redox reactions
chubhunter [2.5K]
Yes they are equal reactions
7 0
3 years ago
one of the isotopes of sulfur is represented as sulfur -35 or S-35. what does the number 35 signify?
Temka [501]
35 is equal to it's mass number
6 0
4 years ago
Read 2 more answers
Explain why water collects in the beaker but not ink
Nuetrik [128]

Answer:

water collects in to the beaker as ink has a higher boiling boint than water. so the water will evaporate and condense into the beaker, which leaves the ink behind in the flask

Explanation:

4 0
3 years ago
Several students want to conduct a descriptive investigation on igneous rocks. Which process is most likely to be part of their
iris [78.8K]

Answer:

A

Explanation:

They will collect samples from different sites and write their observations

8 0
3 years ago
What 987kj to calories
wariber [46]
I think the answer is 233.748 calories
8 0
3 years ago
Other questions:
  • If the daily allowance for Vitamin C is assumed to be 75.0 mg, how many liters (L) of a 0.002486 M solution of ascorbic acid wou
    15·1 answer
  • Which of the following statements is not correct? 0.20 mole of O2 = 6.4 g 0.75 mole of H2CO3 = 47 g 3.42 moles CO = 95.8 g 4.1 m
    15·2 answers
  • CHEM HELP PLSSSSS, I SUCK AT CHEM
    5·1 answer
  • Help...is it Air??? Idk..
    11·1 answer
  • What is produced when a base reacts with water?
    13·1 answer
  • How many molecules of butane (C4H10) are contained in a 9.213 g sample? How many hydrogen atoms are contained in this
    8·1 answer
  • If we had 79.3 grams of Xe, would we expect a volume that is
    5·1 answer
  • Heyyyyyyy......................
    10·2 answers
  • If I throw a 10 kg ball with a force of 60 N, what will the ball's acceleration be?
    14·1 answer
  • What is kept the same in a controlled experiment
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!