All categories

3 years ago

PLEASE HELL ME!!!!

Chemistry

2 answers:

vazorg [7]3 years ago

7 0

Answer:

<h3>The answer is 0.045 kg/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass of cylinder = 14 kg

Volume of a cylinder = πr²h

where

r is the radius

h is the height

$radius = \frac{diameter}{2} \\$

From the question

h = 25 cm

$r = \frac{4}{2} = 2 \: \: \: cm$

The volume of the cylinder is

$V = {2}^{2} (25)\pi \\ = 4 \times 25\pi \\ = 100\pi \\ = 314.159265...$

We have

volume = 314.159 cm³

The density of the cylinder is

$density = \frac{14}{314.159} \\ = 0.044563421...$

We have the final answer as

Hope this helps you

Nat2105 [25]3 years ago

3 0

Answer:

The answer is 0.045 kg/cm³

Explanation:

The density of a substance can be found by using the formula

From the question

mass of cylinder = 14 kg

Volume of a cylinder = πr²h

where

r is the radius

h is the height

From the question

h = 25 cm

The volume of the cylinder is

We have

volume = 314.159 cm³

The density of the cylinder is

We have the final answer as

0.045 kg/cm³

You might be interested in

Determine the number of moles in 382.5g of CO-2

exis [7]

Answer: 8.691 mols of CO₂

Explanation:

To find the number of moles in a given grams, you want to use the molar mass.

Let's first find the molar mass of CO₂.

Carbon's molar mass is 12.011 g/mol

Oxygen's molar mass is 15.999 g/mol

To find molar mass of CO₂, we want to add up the molar mass of carbon and oxygen. Remember, there are 2 Oxygens so we need to mulitply that by 2.

12.011+2(15.999)=44.009 g/mol

Now that we have molar mass, we can convert 382.5 g to mols.

$382.5g*\frac{1 mol}{44.009g} =8.691 mol$

There are about 8.691 mols of CO₂.

5 0

2 years ago

The reaction (CH3)3CBr + OH- (CH3)3COH + Br- in a certain solvent is first order with respect to (CH3)3CBr and zero order with r

son4ous [18]

Answer and Explanation:

The rate constant (K) is related to activation energy (Ea), frequency factor (A) and temperature (T) in Kelvin by the equation

R = molar gas constant

K = A(e^(-Ea/RT))

Taking natural log of both sides

In K = In A - (Ea/RT)

In K = (-Ea/R)(1/T) + In A

Comparing this to the equation of a straight line; y = mx + c

y = In K, slope, m = (-Ea/R), x = (1/T) and intercept, c = In A

a) From the question, m = (-Ea/R) = -1.10 × (10^4) K

(-Ea/R) = -1.10 × (10^4) = -11000

R = 8.314 J/K.mol

Ea = -11000 × 8.314 = 91454 J/mol = 91.454 KJ/mol

b) c = In A = 33.5

A = e^33.5 = (3.54 × (10^14))/s

c) K = A(e^(-Ea/RT))

A = (3.54 × (10^14))/s, Ea = 91454 J/mol, T = 25°C = 298.15 K, R = 8.314 J/K.mol

K = (3.54 × (10^14))(e^(-91454/(8.314×298.15))) = 0.0336/s

QED!

5 0

3 years ago

Help me its due soon thanks

UkoKoshka [18]

Answer:

Explanation:

The gravity accelleration values are the same for both planets.

5 0

3 years ago

Read 2 more answers

A drop of water (H20) has a mass of 2.34 x 10e-2 grams. How many

creativ13 [48]

Answer:

2333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333

Explanation:

2x3=1000

3 0

2 years ago

How did the elements begin to stratify?

Bogdan [553]

Answer:

The process of elemental stratification relies on the diffusion velocity, which causes the migration of the different chemical elements within stars.

Explanation:

8 0

2 years ago