To calculate the density of a sample of matter,you must divide it_____ by its_____

Stels [109]

Answer:

A sound wave is the pattern of disturbance caused by the movement of energy traveling through a medium (such as air, water, or any other liquid or solid matter) as it propagates away from the source of the sound. The source is some object that causes a vibration, such as a ringing telephone, or a person's vocal chords.

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7 0

3 years ago

A solution of LiCl in water is 20.0 wt% LiCl. What is the mole fraction of LiCl?0.09600.4720.1064.44

Tresset [83]

Answer:

mole fraction of LiCl = 0.096

Explanation:

Weight percentage -

weight percentage of A is given as , the weight of the substance A by weight of the total solution multiplied by 100 .

i.e.

weight % A = weight of A / weight of solution * 100

GIven ,

20.0 wt% LiCl

Now ,

Assuming weight of solution = 100 g ,

weight if LiCl = 20.0 g

Since ,

Moles is denoted by given mass divided by the molecular mass ,

Hence ,

n = w / m

n = moles ,

w = given mass ,

m = molecular mass .

From the question ,

molar mass of LiCl = 42.39 g/mol

moles of LiCl = mass / molar mass = 20.0 g / 42.39 g/mol = 0.472 mol

Since , solution = 100 g ,

and ,

Solution = solute + solvent

100g = 20g + solvent

Solvent = 80 g

mass of water = 80 g

water molecular mass = 18 g/mol

moles of water = 80g / 18 g/mol = 4.44 mol

Mole fraction -

It is the ratio of the moles of one of the component of the solution by the mole of the solution .

Total moles of the solution = moles of the solute + moles of solvent

Total moles of the solution = 0.472 mol + 4.44 mol = 4.92 mol

Now ,

mole fraction of LiCl = moles of LiCl / total moles = 0.472 mol / 4.92

mole fraction of LiCl = 0.096

3 0

3 years ago

Mesohippus is the smallest skeleton: skull has a low sloped forehead, legs have three toes. Merychippus is the next largest skel

elena-14-01-66 [18.8K]

Answer:

1) Mesohippus

2) Equus

Explanation:

just did it on e2020

5 0

3 years ago

Read 2 more answers

A metal cylinder has a mass of 6.20 g. The density of the cylinder is 21.0 g/mL. What is the volume

Stolb23 [73]

Answer:

$\boxed {\boxed {\sf v \approx0.295 \ mL}}$

Explanation:

We are asked to find the volume of a metal cylinder. We are given the mass and the density.

We know that density is the mass per unit volume of a substance. It is found using the following formula.

$\rho= \frac {m}{v}$

We know the density is 21.0 grams per milliliter and the mass is 6.20 grams. We substitute these values into the formula.

ρ= 21.0 g/mL
m= 6.20 g

$21.0 \ g/mL = \frac{6.20 \ g}{v}$

We are solving for the volume, so we must isolate the variable v. First, cross multiply. Multiply the first numerator by the second denominator, then the first denominator and the second numerator.

$\frac {21.0 \ g/mL}{1} = \frac{6.20 \ g}{v}$

$21.0 \ g/ mL *v= 6.20 \ g * 1$

$21.0 \ g/ mL *v= 6.20 \ g$

v is being multiplied by 21.0 grams per milliliter. The inverse operation of multiplication is division. Divide both sides of the equation by 21.0 g/mL.

$\frac {21.0 \ g/ mL *v}{21.0 \ g/mL}= \frac{6.20 \ g }{21.0 \ g/mL}$

$v= \frac{6.20 \ g }{21.0 \ g/mL}$

The units of grams cancel.

$v= \frac{6.20 }{21.0 mL}$

$v=0.2952380952$

The original measurements of density and mass both have 3 significant figures, so our answer must have the same. For this number, 3 sig fig is the thousandth place. The 2 in the ten-thousandth place tells us to leave the 5.

$v \approx0.295 \ mL$

The volume of the metal cylinder is approximately <u>0.295 milliliters.</u>

3 0

3 years ago

Plsplsplsplsplsplsplsplsplspls help

MA_775_DIABLO [31]

Answer:

this is difficult but simple to answer

Explanation:

all atoms move in 1 direction no more than 2

6 0

3 years ago

To calculate the density of a sample of matter,you must divide it_____ by its______.

To calculate the density of a sample of matter,you must divide it_ by its__.