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tino4ka555 [31]
3 years ago
8

which combination of temperature and pressure correctly describes standard temperature and pressure, STP? A) 0 degrees C and 101

kPa B) 1 degrees C and 0 kPa C) o degrees C and 22.4 kPa D) 100 degrees C and 100 kPa
Chemistry
2 answers:
dezoksy [38]3 years ago
7 0

Combination of temperature and pressure correctly describes STP: A) 0 degrees C and 101 kPa

<h3>Further explanation</h3>

Standard conditions for temperature and pressure are used as a reference in certain calculations or conditions

There are several standards used by various organizations such as IUPAC or NIST

There are 2 conditions that are usually used as a reference in chemical calculations (mainly for determining the volume per mole of a gas or the molar volume), namely:

  •   1. Standard Conditions

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.

  • 2 Room Condition

Conditions at T 25 ° C and P 1 atm are stated by RTP (Room Temperature and Pressure). Vm in this condition = 24.4 liters / mol

So 1 atm if converted to Pascal:

1 atm = 101,325 kPa

<h3>Learn more </h3>

Which equation agrees with the ideal gas law

brainly.com/question/3778152

brainly.com/question/1056445

Which law relates to the ideal gas law

brainly.com/question/6534096

ASHA 777 [7]3 years ago
5 0

Answer: A


0 degrees and 101 kPa are the conditions that describe the standard temperature and pressure. When expressed in K, the standard temperature 0 degrees equals 273.5 K. Also the standard pressure 101 kPa equals 760 mmHg or 1 Atm.

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chubhunter [2.5K]

The concentration of the solution in units of molarity is 0.64 M and the concentration of the solution in terms of g/mL is 0.10976 g/mL.

<h3>What is the concentration of the solution?</h3>

The measure of the amount of the solute dissolved in the given amount of the solvent or solution is said to be the concentration of the solution.

It is given by the expression,

Concentration of the solution = mass of the solute/total volume of the solution

Units: g/mL

<h3>What is the concentration of the solution in units of molarity?</h3>

The concentration of the solution in units of molarity is given by the expression,

Molarity = (no. of moles of the solute)/(Volume in L)

Units: moles/L

<h3>Calculation:</h3>

It is given that the solute is barium hydroxide - Ba(OH)₂

The mass of Ba(OH)₂ = 2.81 g

When in dissolved in water, the total volume of the solution = 25.6 mL

The molar mass of Ba(OH)₂ = 171.34 g/mol

Then,

No. of moles = (mass of Ba(OH)₂)/(molar mass of Ba(OH)₂)

i.e.,

No. of moles = \frac{2.81}{171.34} = 0.0164 mole

Concentration = mass of the solute/total volume

I.e., C = \frac{2.81}{25.6} = 0.10976 g/mL

Then the concentration of the solution in units of molarity is,

Molarity = (no. of moles)/(Volume of the solution in L)

⇒ Molarity = \frac{0.0164}{25.6/1000} = 0.64 M

Therefore, the concentration of the solution in units of molarity is 0.64 M.

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Therefore, the mass of aluminum in the reaction will the 0.050 mol Al times the atomic weight of aluminum.

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