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
RoseWind [281]
3 years ago
7

A 5.5 gg sample of a substance contains only carbon and oxygen. Carbon makes up 35%% of the mass of the substance. The rest is m

ade of oxygen. You are asked to determine the mass of oxygen in the sample. Which of the following expressions demonstrates a mathematical procedure to solve this problem using the proper order of operations?
a. ((100 - 35)/100) times 5.5 grams =
b. 100 - 35/100 times 5.5 grams =
c. 100 - (35/100) times 5.5 grams=
Chemistry
1 answer:
Elan Coil [88]3 years ago
7 0

Answer:

a. ((100 - 35)/100) times 5.5 grams = 3.575 g

Explanation:

Given that:

The sample of carbon and oxygen = 5.5g

where carbon makes 35% of the mass of the substances.

It implies that oxygen will make: (100 - 35)% = 65%

Suppose y be the mass of the oxygen;

Then:

y = \dfrac{(100-35)}{100} \times 5.5 \ g

y = \dfrac{(65)} {100} \times 5.5 \ g

y = 3.575 \ g

The mass of carbon = \dfrac{35}{100} \times 5.5 \ g

= 1.925 g

You might be interested in
An atom contains 8 valence electrons this atom is probably a
GarryVolchara [31]
Helium
neon
argon
krypton
xenon
radon
4 0
3 years ago
The electron cloud of HF is smaller than that of F2, however, HF has a much higher boiling point than F2 has. Which of the follo
mafiozo [28]

Answer:D

Explanation:

The high boiling point of HF is not attributable to the dispersion forces mentioned in the question. In HF, a stronger attraction is in operation, that is hydrogen bonding. This ultimately accounts for the high boiling point and not solely the dispersion model as in F2.

7 0
3 years ago
Phenolphthalein indicator was added, and the solution in the flask was titrated with 0.215M NaOH until the indicator just turned
NNADVOKAT [17]
In titration, the moles of acid equal moles of base. You were given that 22.75ml of 0.215M NaOH is used, so calculate the number of moles of that base the experiment used in total. After that because you know mol base = mol acid, whatever amount of base you use must be the total amount of acid present in the solution. You were given the volume of the acid, and you have just found the total mols of acid. Using these two information, solve for the concentration. And one more thing, even though I'm pretty sure it won't affect your answer, you should always convert things to the proper units. Since the concentration we're talking about in this problem is molarity, which has the unit mol/L, you should always have all of your numbers in these units. It just make it simpler and will not confuse you
3 0
3 years ago
Read 2 more answers
Which of the following best describes the
ella [17]

Answer: (C)

The frequency increases as the wavelength decreases

Explanation:

The relation between the frequency and wavelength of a wave is

Frequency = 1 / Wavelength

The Frequency of electromagnetic wave is inversely proportional to the wavelength. So, as the frequency increases, the wavelength of the wave decreases and vise-versa.

The frequency of a wave is number of complete cycles passing a particular point per second. Its S.I unit is Hertz whereas the wavelength of a wave is the distance between two consecutive crest and trough in meters.

So, on increasing the frequency of a wave, there will be more number of the cycles of wave per second which will decrease the distance between the consecutive crest and trough i.e wavelength.

4 0
3 years ago
What’s the best answer
Tasya [4]
B) 0.67
Hope this helped
8 0
3 years ago
Other questions:
  • What kind of cells are produced at the end of meiosis?
    15·1 answer
  • Convert 395 grams to kilograms. <br><br> 39500<br> 3.95<br> 3.95E-3<br> 0.395
    10·2 answers
  • Coal can be converted to methane gas by a process called coal gasification. The equation for the reaction is the following: 2 C
    12·1 answer
  • Which of the species would be expected to be the most miscible in benzene (c6h6)? 1. decane, c10h22 2. hydrogen fluoride, hf 3.
    9·2 answers
  • Jack has a rock the rock has a mass of 14 G and the volume of 12 cm power of 2 that what is the Density of the rock?
    14·1 answer
  • Two water solutions that have a density of
    13·1 answer
  • Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction.
    8·1 answer
  • Another set of points have a good day
    8·2 answers
  • Which is the chemical formula for a dinitrogen trioxide molecule?
    10·1 answer
  • Cr(PO4)2 =<br> name the compound
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!