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2 years ago

The measurement of how fast an object moves over a certain amount of time.

2 answers:

5 0

Here is your answer:

Your answer is A velocity.

Because velocity is the amount of speed something is moving.

Ex: a gun being shot
How fast the bullet moves is its velocity.

Your answer is A.

Oksanka [162]2 years ago

3 0

Its usually never the obvious one.. so cross speed out & put A. Velocity.

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I need to know the weighted average please!

maria [59]

Answer:

63.5456 amu

Explanation:

$0.6917*62.9296+0.3083*64.9278= 63.5456\ amu$

8 0

2 years ago

The solubility of oxygen gas in water at 40 ∘c is 1.0 mmol/l of solution. What is this concentration in units of mole fraction?

juin [17]

The formula for mole fraction is:

$mole fraction of solute = \frac{number of moles of solute}{total number of moles of solution}$ -(1)

The solubility of oxygen gas = 1.0 mmol/L (given)

1.0 mmol/L means 1.0 mmol are present in 1 L.

Converting mmol to mol:

$1.00 mmol\times \frac{1 mol}{1000 mmol} = 0.001 mol$

So, moles of oxygen = 0.001 mol

For moles of water:

1 L of water = 1000 mL of water

Since, the density of water is 1.0 g/mL.

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

$Mass = 1.0 g/ml\times 1000 mL = 1000 g$

So, the mass of water is 1000 g.

Molar mass of water = 18 g/mol.

Number of moles of water = $\frac{1000 g}{18 g/mol} = 55.55 mol$

Substituting the values in formula (1):

$mole fraction = \frac{0.001}{55.55+0.001}$

$mole fraction = 1.8\times 10^{-5}$

Hence, the mole fraction is $1.8\times 10^{-5}$ .

7 0

2 years ago

How many moles of magnesium hydroxide, Mg(OH)2 can be created using 2.23 x 10^24 oxygen atoms?

igor_vitrenko [27]

Answer:

32.07 g/mole.

Explanation:

how this helps you young blood

7 0

2 years ago

If 50.0 g of water saturated with potassium chloride at 80.0°C is slowly evaporator to dryness, how many grams of the dry salt w

balu736 [363]

Answer:

25.0 g.

Explanation:

From the solubility curve that is shown in the attached image, the solubility of KCl per 100.0 g of water is about 50.0 g.

<em>So, a saturated solution of KCl in 50.0 g of water will contain about 25.0 g.</em>

<em>Thus, the grams of the dry salt that will be recovered is 25.0 g.</em>

5 0

2 years ago

The reaction type represented by AB ---> A + B is known as

nordsb [41]

Answer:

A. synthesis

Explanation:

8 0

2 years ago