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3 years ago

10

What greenhouse gas will stay in the atmosphere the longest

1 answer:

Rama09 [41]3 years ago

3 0

Nitrous oxide will stay in the atmosphere the longest.

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You throw a ball straight up in the air trying to throw it as high as possible. What do you think happens to the balls kinetic e

mote1985 [20]

With the info given i would have to say their is no kinetic energy, it's all potential energy.

6 0

3 years ago

Which has more neutrons: Cobalt or Nickel?

Inessa05 [86]

Answer:

Because the most common form of Nickel is Ni-58 while the most common form of Cobalt is Co-59, this means that Cobalt (which is number 27 on the periodic table) has 27 protons and 32 neutrons. Therefore 1 less proton but 2 more neutrons and hence has a greater mass than Nickel.

Explanation:

7 0

2 years ago

How many moles are in 9.25E24 formulas units of sodium acetate?

Lelu [443]

Answer:

<h2>15.37 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{9.25 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 15.365448...$

We have the final answer as

<h3>15.37 moles</h3>

Hope this helps you

5 0

3 years ago

sladkih [1.3K]

Answer:

A = 65.46 u

Explanation:

Given that,

The composition of zinc is as follows :

Zn-64 = 48.63%

Zn-66 = 27.90%

Zn-67 = 4.10%

Zn-68 = 18.75%

Zn-70 = .62%

We need to find the average atomic mass of the given element. It can be solved as follows :

$A=\dfrac{48.63\times 64+27.90\times 66+4.1\times 67+18.75\times 68+0.62\times 70}{100}\\A=65.46\ u$

So, the average atomic mass of zinc is 65.46 u.

6 0

2 years ago

Copper is a solid phase of copper still unknown to science. The only difference between it and ordinary copper is that Copper fo

Scrat [10]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The density is $\rho = 8.21479 g/cm^3$

Explanation:

From the question we are told that

the lattice constant is $a = 0.295 nm = 0.295*10^{-9} = 0.295*10^{-7} cm$

The density of Copper ( $\beta$ ) is mathematically represented as

$\rho = \frac{ZM}{a^3N_A}$

Where Z is the number of units in a unit cell and for BCC crystals Z =2

M is the molar mass of copper which same for Copper with a value of

$M = 63.5 g/mol$

$N_A$ is the Avogadro's constant with a value of $N_A = 6.022*10^{23}$

Substituting values

$\rho = \frac{2 *63.5}{(0.295*10^{-7})^3 * (6.022*10^{23})}$

$\rho = 8.21479 g/cm^3$

8 0

3 years ago