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3 years ago

Which of these is a renewable resource? *

Chemistry

2 answers:

kotykmax [81]3 years ago

4 0

Answer:

Tree

Explanation:

A tree will regrow. Coal, oil and natural gas will not.

STALIN [3.7K]3 years ago

3 0

Its a tree, cause it can grow back. Everything else can’t.

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When there are 0.0814 moles of hockey pucks how many hockey pucks are there?

Dovator [93]

Answer:

4.9 x 10²²hockey pucks

Explanation:

Given parameters:

Number of moles of hockey = 0.0814moles

Unknown:

Number of pucks there = ?

Solution:

A mole of a substance is made up of Avogadro's number of particles.

Therefore;

1 mole of hockey pucks will contain 6.02 x 10²³ hockey pucks

0.0814 mole of hockey pucks will contain :

0.0814 x 6.02 x 10²³ = 4.9 x 10²²hockey pucks

8 0

3 years ago

The average molecular speed in a sample of Ar gas at a certain temperature is 391 m/s. The average molecular speed in a sample o

adoni [48]

Answer:

550 m/s

Explanation:

The average molecular speed (v) is the speed associated with a group of molecules on average. We can calculate it using the following expression.

$v = \sqrt{\frac{3 \times R \times T}{M} }$

where,

R: ideal gas constant

T: absolute temperature

M: molar mass of the gas

We can use the info of argon to calculate the temperature for both samples.

$T = \frac{v^{2} \times M}{3 \times R} = \frac{(391m/s)^{2} \times 39.95g/mol}{3 \times 8.314J/k.mol} = 2.45 \times 10^{5} K$

Now, we can use the same expression to find the average molecular speed in a sample of Ne gas.

$v = \sqrt{\frac{3 \times R \times T}{M} } = \sqrt{\frac{3 \times (8.314J/k.mol) \times 2.45 \times 10^{5}K }{20.18g/mol} } = 550 m/s$

7 0

3 years ago

3. The molar volume of a gas at STP occupies 0 1 kilopascal O ooc 12 grams 22.4 L

Reil [10]

The molar volume of a gas at STP occupies 22.4 L.

Option D

Explanation:

To find the volume of 1 mole of a gas at STP, we use the Ideal Gas Law. It is the general gas equation which gives the relation to the measurable quantities to an ideal gas as below,

P (pressure) × V (volume) = n (number of moles) × R (the gas constant) × T (temperature in Kelvin)

STP = 1 atm of pressure and 273 K for temperature

P = 1 atm

V = ?

n = 1 mole

R = 0.0821 atm L/mol K

T = 273 K

Using the equation,

$\mathrm{PV}=\mathrm{nRT}$

$V=\frac{n R T}{P}$

By substituting the above values, in the equation,

$V=\frac{1 \times 0.082 \times 273}{1}=22.38\ L$

V = 22.38 L

8 0

3 years ago

An object weighing 90 n has a volume of 45 ml and a mass of 9.0 g what is its density

UNO [17]

D= mass over volume

So, density equals 9.0g divided by 45ml.

SO, D=.25 g/ml

I'm not 100% sure this is correct, though. Best if luck. ♡

7 0

4 years ago

HElP ASAP Please! brainliest aswell: If 56 grams of carbon monoxide burns in oxygen to produce 88 grams of carbon dioxide, the m

Klio2033 [76]

The answer is A brainleiest pwez?

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4 years ago

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