WILL GIVE BRAINLIEST

Aplicaciones del agua pesada en medicina

Phantasy [73]

Answer:

What single percentage change is equivalent to a 11% increase followed by a 15% increase?

Explanation:

What single percentage change is equivalent to a 11% increase followed by a 15% increase?

6 0

2 years ago

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1.) A balloon contains 0.126 mol of gas and has a volume of 2.74 L .

Ann [662]

Answer:

Problem 1: 5.44L

Problem 2: 479mL

Explanation:

<h2>Problem 1. </h2>

a) Data:

n₁ = 0.126 mol
V₁ = 2.74 L
n₂ = 0.126mol + 0.124mol
V₂ = ?
Conditions: constant temperature and pressure

b) Physical principles:

The volume occupied by a gas, when the temperature and pressure remain unchanged, is proportional to the number of moles of gas.

$\dfrac{n_1}{V_1}=\dfrac{n_2}{V_2}$

c) Solution:

Solve for V₂ , substitute and compute:

$V_2=n_2\times\dfrac{V_1}{n_1}\\ \\\\ V_2=(0.126mol+0.124 mol)\times \dfrac{2.74L}{0.126mol}\\ \\ \\ V_2=5.44L$

<h2>Problem 2.</h2>

a) Data:

n₁ = 0.547mol
V₁ = 295 mL
V₂ = ?
n₂ = 0.547mol + 0.342 mol
Conditions: constant temperature and pressure

b) Physical principles:

The same as above: the volume occupied by a gas, when the temperature and pressure remain unchanged, is proportional to the number of moles of gas.

$\dfrac{n_1}{V_1}=\dfrac{n_2}{V_2}$

c) Solution:

Solve for V₂ , substitute and compute:

$V_2=n_2\times\dfrac{V_1}{n_1}\\ \\\\ V_2=(0.547mol+0.342 mol)\times \dfrac{295mL}{0.547mol}\\ \\ \\ V_2=479mL$

4 0

2 years ago

Calculate the ΔG for the following system. Then state if the system is spontaneous or not spontaneous. ΔH = 147 kJ ΔS = -67.0 J/

lbvjy [14]

Answer:

ΔG for the given system is 28.421 kJ. The system is non spontaneous.

Explanation:

ΔH = 147 kJ =147,000 J= Enthalpy of the system

ΔS = -67.0 J/K = Entropy change

T = 149 °C = 422.15 K = Temperature of the system

((T)°C=273.15 +T K)

ΔG = Gibbs free energy ?

The Gibbs free energy 's expression is given by:

ΔG = ΔH - T ΔS

ΔG > 0 , non spontaneous
ΔG < 0, spontaneous

$\Delta G^o=147,000 J-422.15 K\times (-67.0)$

ΔG = 28,421 J = 28.421 kJ

Since, value of Gibbs free energy is positive this means that reaction is non spontaneous.

5 0

3 years ago

After the discovery of the microscope, many microorganisms were placed into taxonomic categories. What characteristic of science

Mrac [35]

It changes with new evidence.

The example shows that science changes with new evidence. Science can not change with common beliefs because first of all beliefs should be proved and become evidence. Second, science is not fixed because of the scientific method and experimentation, which is a phase of the scientific method.

5 0

3 years ago

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What is a hypothesis

zmey [24]

A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.

4 0

3 years ago

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