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katen-ka-za [31]

3 years ago

13

You are unsure of the volume of a substance, but you know that it has a density of 4 g/ml and a mass of 16 grams. What is its vo

lume?

1 answer:

avanturin [10]3 years ago

3 0

Answer:

4 mL

Explanation:

Use the density formula, d = m/v

Plug in the density and mass to solve for v:

4 = 16/v

4v = 16

v = 4

So, the volume is 4 mL

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Cylinder with a mass of 12g has a radius measuring 2cm and height of 6cm what is its density

lakkis [162]

Answer:

Given:

m = 12 g, the mass of the cylinder

r = 2 cm, the radius of the cylinder

h = 6 cm, the height of the cylinder.

Calculate the volume, V, of the cylinder.

V = πr²h

= π*(2 cm)²*(6 cm)

= 75.398 cm³

By definition,

density = mass/volume.

Therefore,

density = m/V

= (12 g)/(75.398 cm³)

= 0.159 g/cm³

= 0.16 g/cm³ (nearest hundredth)

Answer: 0.16 g/cm³

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3 years ago

Which of the following will result in a chemical change?

Alinara [238K]

C burning coal in a furnace

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If Shauna takes her new kitten to the veterinarian for a check-up and the kitten's weight is recorded as 425 grams , how many po

trapecia [35]

answer: 0.936965

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3 years ago

gaseous methane undergoes complete combustion by reacting with oxygen to form carbon dioxide and water vapor . what is the balan

babunello [35]

CH4(g) + 2 O2(g) ----> CO2(g) + 2 H2O(g)

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3 years ago

How many H atoms are in 6.43g x 10^24 molecules of water

kow [346]

Answer:

$12.86\times 10^{24}$ atoms of hydrogen

Explanation:

The molecular formula for a water molecule is $H_2O$ .

From the above formula, we can conclude that 1 molecule of water contains 2 atoms of hydrogen and 1 atom of oxygen.

There are $6.43\times 10^{24}$ molecules of water.

1 molecule of water = 2 atoms of hydrogen.

∴ $6.43\times 10^{24}$ molecules of water = $2\times 6.43\times 10^{24}=12.86\times 10^{24}$ atoms of hydrogen.

Therefore, there are $12.86\times 10^{24}$ atoms of hydrogen in $6.43\times 10^{24}$ molecules of water.

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3 years ago