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s2008m [1.1K]
2 years ago
7

Limestone has a density of 2.72 g/cm3. What is the mass of 8.92 cm3 of limestone?

Chemistry
2 answers:
timurjin [86]2 years ago
8 0
It should be 24.2624 because if there’s 2.72g in every cm3 and there are 8.92 cm3, then you simply multiply the two numbers
hope this helped :)
kati45 [8]2 years ago
3 0

Answer:

\boxed {\boxed {\sf 24.2624 \ g}}}

Explanation:

Density measures mass per volume. The volume is

\rho=\frac{m}{v}

The density of limestone is 2.72 grams per cubic centimeter. We have a piece of limestone with a volume of 8.92 cubic centimeters.

  • ρ= 2.72 g/cm³
  • v= 8.92 cm₃

Substitute the values into the formula.

2.72 \ g/cm^3=\frac{m}{8.92 \ cm^3}

Now we solve for m, the mass, by isolating the variable.

m is being divided by 8.92 cubic centimeters. The inverse of division is multiplication, so we multiply both sides by 8.92 cubic centimeters.

8.92 \ cm^3 * 2.72 \ g/cm^3=\frac{m}{8.92 \ cm^3}* 8.92 \ cm^2

8.92 \ cm^3 * 2.72 \ g/cm^3=m

The units of cubic centimeters cancel out.

24.2624 \ g =m

The mass of this piece of limestone is 24.2624 grams.

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musickatia [10]

Answer: depending on the method, 138-139 (imperial) gallons, or 626 L

Explanation:

The wt of water is 4924-3547 lb = 1377 lb = 1377/2.2 kg = 626 kg = 626 L

1gallon = 4.5 L (it does where I come from and who still measures things in imperial anyway?) so I guess  that is 139 gallons

or alternatively, I recall from distant childhood, “a pint of water weighs a pound and a quarter” which means 1 gallon = 10 lb, so 1377 lb = ~138 gallons

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1.13×10^25 molecules of water.

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It is important to first put down the balanced reaction equation. It is not possible to solve any problem on stoichiometric relationship without a balanced reaction equation. Once the equation is obtained, we can now proceed with other steps in the solution of the problem.

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