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
Masteriza [31]
3 years ago
6

Calculate the molality of a 24.4% (by mass) aqueous solution of phosphoric acid (h3po4).

Chemistry
1 answer:
user100 [1]3 years ago
8 0
Molality pertains to a concentration of a mixture expressed in moles of solute per kg of solvent. Based on the given problem, the solute is the phosphoric acid with molecular weight of 97.99 g/mol. Assuming 1 g of sample, the mole of solute is equal to 0.244*(97.99) = 2.49x10-3 moles. The remaining percentage,t that is, 1-0.244 is the amount of solvent, which is equal to 0.756 g based on 1 gram assumption. Therefore, the molality is,
(0.244)*(mol/97.99 g)/(1-0.244)*(1 kg/1000 g) = 3.29 molala
You might be interested in
What is the process of breaking down food so that it can be used by living things??​
Darya [45]

I think the answer you're looking for is digestion.

4 0
2 years ago
______ is the type of heat that roasts the marshmallows.
disa [49]

Answer:

I think B

tell me if I'm wrong

5 0
3 years ago
**Plz help with this asap who ever replies first with the right answer will get brainlists
Vesna [10]

Answer:first D. 88L

Second A 2*10^24

Explanation:

At stp 1 mole = 22.4L

mw Cl2= 70.9

280 g =280/70.9 moles, about 4

4*22.4 = about 88

aw Sr 87.6 —> 6.02214076*10^23 atoms = 1 mole

5 0
2 years ago
In the polypeptide Phe-Tyr-Glu-Asp-Ser-Ile-Leu-Ser what is the N-terminal amino acid?
avanturin [10]

Answer:

N-terminal Phe, C-terminal Ser

Explanation:

Amino acids connect like

NH2 -CH(R1) -CO -NH-CH(R2)-CO-.....-NH-CH(Rn)COOH

So, 1st amino acid is N -terminal , and it is Phe.

Last amino acid is C- terminal, and it is Ser.

7 0
3 years ago
55 L of a gas at 25oC has its temperature increased to 35oC. What is its new volume?
ladessa [460]

Answer:

Approximately 56.8 liters.

Assumption: this gas is an ideal gas, and this change in temperature is an isobaric process.

Explanation:

Assume that the gas here acts like an ideal gas. Assume that this process is isobaric (in other words, pressure on the gas stays the same.) By Charles's Law, the volume of an ideal gas is proportional to its absolute temperature when its pressure is constant. In other words

\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1},

where

  • V_2 is the final volume,
  • V_1 is the initial volume,
  • T_2 is the final temperature in degrees Kelvins.
  • T_1 is the initial temperature in degrees Kelvins.

Convert the temperatures to degrees Kelvins:

T_1 = \rm 25^{\circ}C = (25 + 273.15)\; K = 298.15\; K.

T_2 = \rm 35^{\circ}C = (35 + 273.15)\; K = 308.15\; K.

Apply Charles's Law to find the new volume of this gas:

\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1} = \rm 55\;L \times \frac{308.15\; K}{298.15\; K} = 56.8\; L.

8 0
3 years ago
Other questions:
  • Give the number of significant figures in this number: 40
    7·2 answers
  • In which of the following types of reactions are electrons gained?
    10·2 answers
  • For problems 2 & 3, the density of the sample is 0.9977 g/mL and the molar mass of calcium carbonate is 100.0 g/mol. 2. Calc
    12·1 answer
  • All plants and animals need energy in order to survive. The diagram above shows how energy gets transferred among living things
    8·1 answer
  • Why the piece of sodium chloride is hard than sodium metal?
    14·1 answer
  • True or false. The center of gravity and center of mass of an object need to be in the same spot?
    15·2 answers
  • Use the drop-down menus to identify the ocean found at each point on the map. A B C D E those are for the drop-down menu arctic
    15·2 answers
  • Help plz:)))I’ll mark u Brainliest
    12·1 answer
  • PLEASE HELP!!!!!!!!!!!!!
    14·1 answer
  • (Multiple choice) Of the following species, which is most likely to be oxidized?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!