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3 years ago

What is the salinity seawater?

1 answer:

7 0

<span>Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of approximately 3.5% or 35 parts per thousand. This means that for every 1 liter (1000 mL) of seawater there are 35 grams of salts (mostly, but not entirely, sodium chloride) dissolved in it.
I used google
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Solve the equation for x.4+2(x-4)=-7(x+7)

OverLord2011 [107]

Answer:

$x=-5$

Explanation:

we have

$4+2(x-4)=-7(x+7)$

Solve for x

That means----> Isolate the variable x

Applying the distributive property both sides

$4+2(x)+2(-4)=-7(x)-7(7)$

Remember that

$(+1)(-1)=-1$

$4+2x-8=-7x-49$

Combine like terms left side

$2x-4=-7x-49$

Adds 7x both sides

$2x-4+7x=-7x-49+7x$

$9x-4=-49$

Adds 4 both sides

$9x-4+4=-49+4$

$9x=-45$

Divide by 9 both sides

$x=-5$

4 0

3 years ago

How many atoms are in 1.4 mol of phosphorus trifluoride (PF3)?

joja [24]

Number of atoms in 1.4 mol of Phosphorus trifluoride (PF₃) : 8.428 x 10²³

<h3>Further explanation </h3>

The mole is the number of particles(molecules, atoms, ions) contained in a substance

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

1.4 mol of Phosphorus trifluoride (PF₃), number of atoms :

$\tt N=1.4\times 6.02\times 10^{23}\\\\N=8.428\times 10^{23}$

5 0

3 years ago

Suppose you have a dozen carbon atoms, a dozen gold atoms, and a dozen iron atoms. Even though you have the same number of each,

mixer [17]

Answer:

By weight they have the same mass, but the number of atoms is different

Explanation:

3 0

4 years ago

Read 2 more answers

Precipitation that flows into river, lakes, and streams is called

mars1129 [50]

This would be the downward movement of water. It begins flowing and continues in a downward movement moving throughout,

7 0

4 years ago

Read 2 more answers

Element fact sheet <br> Help!!!!

Alex17521 [72]

Element name: Neon
element symbol: Ne
atomic number: 10
atomic mass: 20.1797
number of protons: 10
number of neutrons: 10
number of electrons: 2,8
interesting fact: the name means new, and it is pulled out of the air.
for the rest just add a neon bohr model ig

7 0

3 years ago