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
zhuklara [117]
3 years ago
11

A 250-mL aqueous solution contains 1.56 mc025-1.jpg 10–5 g of methanol and has a density of 1.03 g/mL. What is the concentration

in ppm?
A 6.1 X 10^-8 ppm
B 1.5 X 1-^-5 ppm
C 0.061 ppm
D 15 ppm
Chemistry
2 answers:
Elis [28]3 years ago
4 0
The right answer for the question that is being asked and shown above is that: "B 1.5 X 1-^-5 ppm." A 250-mL aqueous solution contains 1.56 mc025-1.jpg 10–5 g of methanol and has a density of 1.03 g/mL. The concentration in ppm is that <span>1.5 X 1-^-5 ppm</span>
Sergio039 [100]3 years ago
4 0

Answer: The correct option is C.

Explanation: ppm is used to measure the concentration of solute in a given volume of solution. ppm is basically parts per million.

Mathematically,

ppm=\frac{\text{Mass of solute (in mg)}}{\text{Volume of solution (in L)}}

We are given:

Mass of methanol = 1.56\times 10^{-5}g=1.56\times 10^{-2}mg  (Conversion Factor : 1g = 1000mg)

Volume of solution = 250 mL = 0.250L   (Conversion Factor : 1L = 1000mL)

Putting values in above equation, we get:

ppm=\frac{1.56\times 10^{-2}mg}{0.250L}

Concentration of methanol = 0.062ppm

Hence, the correct option is C.

You might be interested in
Difference between nitrogen 14 and nitrogen 15
Tema [17]
Did you ever get this answer
5 0
3 years ago
Asdfjkl;asdfjkl;asdfjkl;asdfjkl;asdfjkl;asdfjkl;asdfjkl;
horsena [70]

Answer: ok ill just take my points in dip

Explanation:

3 0
2 years ago
58. Explain why each successive ionization of an electron
ale4655 [162]

Answer:

It's because removal of electron from an atom, reduces the size of an atom.

Explanation:

When an electron is removed from an atom, it becomes an ion and in this case it will become a postive ion.

When an electron is removed from an atom, the charge balance of an atom is disturbed and positive charge increases in comparison to the negative charge. This results in increase nuclear (positive) charge which exerts greater attraction on the remaining electrons and as a result the remaining electrons are more strongly attracted by the nucleus and in this way the atomic size is decreased. Due to this increased nuclear attraction and reduced atomic size, it bcomes difficult to remove more electeon from the positively charged ion of reduced size. This is the reason that each successive ionization of electron requires a greater amount of energy.

The ionization energy has inverse relation with the size or radius of an atom. This also justifies the reason that why each successive ionization of an electron requires greater amount of energy.

6 0
3 years ago
Which of the following best explains why you sanded the copper wire before burning it? to create less friction between the coppe
artcher [175]

The copper wire was sanded before burning in order to make sure that copper metal was exposed on the surface of the wire.

Answer: B

Explanation

The copper wire when placed in atmosphere without coating leads to oxidation of copper metal with respect to the impurities present in the atmosphere.

As copper is electropositive in nature, so electronegative ions present in the universe will try to react with copper and the copper will react easily with other elements.

So generally copper wire is coated with color or polymer coating.

In this case, the copper wire without any coating is sanded, so that the eddy sheets or polishing materials on friction with copper wire will remove the impurities by the electrostatic law of conservation of charges and charge transfer.

As the impurities are removed when copper wire is sanded, the copper atoms will be exposed on the surface of the wire leading to burning of copper in the copper wire.

8 0
3 years ago
How many moles of glucose are produced? <br><br><br><br> How many moles of oxygen are produced?
frozen [14]

Explanation:

5.00 mol H2O × (1 mol C6H12O6/6 mol H2O)

= 0.833 mol C6H12O6

5.00 mol H2O × (6 mol O2/6 mol H2O)

= 5.00 mol O2

6 0
3 years ago
Other questions:
  • 1. What Volume of HCl is generated if 3.44 g of Cl2 are reacted at STP? 2. What volume does 4.87 mol of Kr have at STP? 3. What
    7·1 answer
  • The unit "troy ounce" is often used for precious metals such as gold (Au) and platinum (Pt) (1 troy ounce= 31.103 g). (a) A gold
    14·1 answer
  • 2.25 g/ml at 700mmHg, 200 C. Find molar mass of gas.
    15·1 answer
  • Xenon is an element similar to Neon. Its density can be found on the Reference Table. Convert Xenon’s density to scientific nota
    12·1 answer
  • What is true of neutrons?
    11·1 answer
  • Battery acid has a density of 1.285 g/mL and contains 38.0% sulfuric acid by mass. The car battery contains 1.45 L of battery ac
    15·1 answer
  • What is the freezing point of a 2.00 m solution with phenol as<br> the solvent?
    15·1 answer
  • Which method is used to obtain petrol from petroleum?
    6·2 answers
  • A gas phase mixture of H2 and N2 has a total pressure of 784 torr with an H2 partial pressure of 124 torr. What mass of N2 gas i
    12·1 answer
  • Need help with this
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!