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3 years ago

2. If you have an unknown quantity of gas at a pressure of 1.2atm, a volume of 31 L, and a

Chemistry

1 answer:

Arturiano [62]3 years ago

8 0

Answer:

1.259 mol

Explanation:

Given data:

Pressure of gas = 1.2 atm

Volume of gas = 31 L

Temperature of gas = 87°C

Number of moles = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K

T = temperature in kelvin

Now we will convert the temperature.

87+273 = 360 K

by putting values,

1.2 atm × 31 L = n×0.0821 atm.L/ mol.K × 360 K

37.2 atm.L = n× 29.556 atm.L/ mol

n = 37.2 atm.L / 29.556 atm.L/ mol

n = 1.259 mol

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Round the following numbers to 3 significant figures.

ozzi

Explanation:

13. 8,448 = 8,450 (round up, 8 more than 5)

14. 89.32 = 89.3 (round down, 2 less than 5, 0 is not needed)

15. 0.05678 = 0.0568 (round up, 8 more than 5, 0 in front are not significant)

7 0

3 years ago

How many moles are there in 1.20 x 1025 particles of helium?

Anettt [7]

Answer:

You would get 19.969 moles.

Explanation:

You would get 19.969 moles.

3 0

2 years ago

1. When the temperature of a rigid hollow sphere containing 685 L of helium gas is

mote1985 [20]

<h3>Answer:</h3>

250.756 moles He

<h3>Explanation:</h3>

From the question we are given;

Volume, L = 685 L

Temperature, T = 621 K

Pressure, P = 189 × 10 kPa

We are required to calculate the number of moles of the gas,

Using the Ideal gas equation,

PV = nRT, where P is the pressure, V is the volume, T is the temperature, n is the number of moles, and R is the ideal gas constant.

We can replace the known variables and constant in the equation to get the unknown variable, n.

Using ideal gas constant as 8.3145 L.kPa/K/mol

$n=\frac{PV}{RT}$

$n=\frac{(1890)(685)}{(8.3145)(621)}$

$n = 250.7557 moles$

n = 250.756 moles

The moles of helium contained in the sphere is 250.756 moles

6 0

3 years ago

Complexes containing metals with d10 electron configurations are typically colorless because ________. Complexes containing meta

algol [13]

Answer:

there is no d electron that can be promoted via the absorption of visible light

Explanation:

One of the properties of transition elements is the possession of incompletely filled d orbitals. This property accounts for their unique colours.

The colours of transition metal compounds stem from d-d transition of electrons due to the presence of vacant d orbitals of appropriate energy to which electrons could be promoted.

For elements whose atoms have a d10 configuration, such vacant orbitals does not exist hence their compounds are not colored.

Sometimes, the colour of transition metal compounds stem from ligand to metal charge transfer(LMCT) for instance in KMnO4.

8 0

2 years ago

16. What is a pure substance formed when two or more different elementscombine called?A. compoundB. moleculeC. element

Lana71 [14]

<h2>Answer:</h2>

Compound. Option A is correct

<h2>Explanations:</h2>

When two or more different elements combines, a compound is formed. For instance, if carbon and oxygen combines, carbondioxide is formed according to the equation;

$C+O_2\rightarrow CO_2$

From the reaction, carbon and oxygen are the elements while carbondioxide is the compound. Hence we can conclude that a pure substance formed when two or more different elements combine called compound.

3 0

1 year ago