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
zzz [600]
3 years ago
11

I have 2 samples of solid chalk (aka calcium carbonate). Sample A has a total mass of 4.12 g and Sample B has a total mass of 19

.37 g. What is the difference between the samples?
A) Sample B has more calcium carbonate molecules
B) Sample B has a larger ratio of carbon, oxygen, and calcium atoms
C) Sample B has more calcium ion than carbonate ions
D) Sample B must have some impurity
Chemistry
1 answer:
IRINA_888 [86]3 years ago
7 0

Answer:

A) Sample B has more calcium carbonate molecules

Explanation:

M = Molar mass of calcium carbonate = 100.0869 g/mol

N_A = Avogadro's number = 6.022\times 10^{23}\ \text{mol}^{-1}

For the 4.12 g sample

Moles of a substance is given by

n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{4.12}{100.0869}\\\Rightarrow n=0.0411\ \text{mol}

Number of molecules is given by

nN_A=0.0411\times 6.022\times 10^{23}=2.48\times 10^{22}\ \text{molecules}

For the 19.37 g sample

n=\dfrac{19.37}{100.0869}\\\Rightarrow n=0.193\ \text{mol}

Number of molecules is given by

nN_A=0.193\times 6.022\times 10^{23}=1.16\times 10^{23}\ \text{molecules}

1.16\times 10^{23}\ \text{molecules}>2.48\times 10^{22}\ \text{molecules}

So, sample B has more calcium carbonate molecules.

The ratio of the elements of carbon, oxygen, calcium atoms, ions, has to be same in both the samples otherwise the samples cannot be considered as calcium carbonate. Same is applicable for impurities. If there are impurites then the sample cannot be considered as calcium carbonate.

You might be interested in
How far will a car go that is moving at 10 m/s in 1 hour
Airida [17]

Answer:

36,000 miles in one hour.

Explanation:

Because there are 60 seconds in a minute and 60 minutes in an hour so to find out how many seconds are in an hour you multipy 60x60 to get 3600. Then to find out how many miles in the 3600 seconds you multiply 10 x 3600 to get 36000.

4 0
3 years ago
Q1.
dlinn [17]

Answer:

there are four peaks in the 13c NMR (B)

3 0
3 years ago
5. Students hypothesize that temperature is a limiting factor for the germination of seeds. They carry out an experiment to
Lelechka [254]

Answer:

keep adding to on each term its quit simple

8 0
2 years ago
What type of reaction is shown below? <br> Ca + 2H2O - Ca(OH)2 + H2
krek1111 [17]
A + BC  ---> AB + C
So here one reactant (A) is accepting a group which is being given by another compound (BC) however the A is not giving any group / element or ion
So this single displacement
Similarly in the given reaction
the anion OH- is only being replaced
The element Ca accepts OH- and H2O loses the same group to form new element H2
So the correct answer is
Single replacement also known as single displacement.
5 0
2 years ago
Which type of decay has the greatest mass?<br> A.<br> alpha<br> B. beta<br> gamma<br> D.<br> nuclear
coldgirl [10]

Answer:

Alpha has the greatest mass- A.

3 0
2 years ago
Read 2 more answers
Other questions:
  • PLEASEEEEEEEE ASAPPPPPWhat is the density of a piece of cardboard that has a mass of 250 g and volume of 46 mL? *
    9·2 answers
  • Highlight the basic points in Lewis and Langmuir theory of electrovalency
    6·1 answer
  • Define an independent variable in an experiment. Explain the term with respect to the solubility of salt at different temperatur
    13·1 answer
  • On a container of chicken broth you notice the instructions to ""shake well before serving."" Which of the following best descri
    12·1 answer
  • What is the total mass (amu) of carbon in each of the following molecules?
    6·1 answer
  • 9.54 kJ of heat is required to raise the temperature of 225.0 g of a substance from 21.5 oC to 46 oC. Which of the following hea
    14·1 answer
  • Give me lil reasoning so I know your not lying for points
    8·1 answer
  • What is the frequency of an electromagnetic wave with a wavelength of 1.0 x 10' m?
    12·1 answer
  • Write the balanced molecular chemical equation for the reaction in aqueous solution for ammonium sulfate and iron(II) chloride.
    7·1 answer
  • An ion of a single pure element always has an oxidation number of ________. a. 1 b. magnitude equal to its atomic number c. 0 d.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!