All categories

2 years ago

In 1687, ___ explained that gravitational forces hold the solar system together.

Chemistry

2 answers:

elena55 [62]2 years ago

5 0

The answer is A. Newton

Nimfa-mama [501]2 years ago

3 0

Newton ,perhaps as many other originations use it as a gravitational law

You might be interested in

Um pacote de iogurte tem 500g de um produto. A quanto equivale essa massa em quilogramas?

Rudik [331]

<span>5 quilos
dfghjjjjjjjjjjjjjjjjj

</span>

6 0

2 years ago

The molar solubility of pbi2 is 1.5 103 m.

Vsevolod [243]

Answer: -

Concentration of PbI₂ = 1.5 x 10⁻³ M

PbI₂ dissociates in water as

PbI₂ ⇄ Pb²⁺ + 2 I⁻

So PbI₂ releases two times the amount of I⁻ as it's own concentration when saturated.

Thus the molar concentration of iodide ion in a saturated PbI₂ solution = [ I⁻] =

= 1.5 x 10⁻³ x 2 M

= 3 x 10⁻³ M

PbI₂ releases the same amount of Pb²⁺ as it's own concentration when saturated.

[Pb²⁺] = 1.5 x 10⁻³ M

So solubility product for PbI₂

Ksp = [Pb²⁺] x [ I⁻]²

=1.5 x 10⁻³ x (3 x 10⁻³)²

= 4.5 x 10⁻⁹

8 0

2 years ago

Which of the following is true of the relationships between heat of fusion and heat of vaporization?

klio [65]

Answer:

The heat of vaporization is typically larger than the heat of fusion

Next question answer:

The liquid water absorbs heat from the skin surface and is transferred to the air when the water evaporates.

Explanation:

6 0

2 years ago

Calculate the molar mass of a gas

spin [16.1K]

Answer:

MOLAR MASS = 32 g/mol

Explanation:

Condition of standard temperature and pressure(STP) are as follow:

Temperature = 273 K

Pressure = 1 atm (or 100000 Pa)

Here atm is atmosphere and Pa is Pascal

STP conditions arte used for measuring gas density and volume using Ideal Gas Law.Here 1 mole of ideal gas occupies 22.4 L of volume.

According toi Ideal Gas Equation :

PV = nRT

where P = pressure, n= number of moles, V = volume ,R= Ideal Gas Constant and T= temperature

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

From question:

V=280 ml = 0.28 L

P = 1 atm

R=0.08205 L atm/K mol

T=273 K

Putting values in above formula :

$n=\frac{1\times .280}{0.08205\times 273}$

n = 0.0125 moles

Now $n=\frac{given\ mass}{Molar\ mass}$

$Molar\ mass=\frac{given\ mass}{n}$

given mass = 0.4 g (given)

$Molar\ mass=\frac{0.4}{0.0125}$

On solving we get:

Molar mass = 32 g/mol

4 0

2 years ago

Why do gases diffuse faster than liquids? Gas particles have more kinetic energy a liquid does not have as many particles liquid

Readme [11.4K]

Gases have more kinetic energy

5 0

2 years ago

Read 2 more answers