3 years ago

What is the empirical formula for a compound that has 31.2% calcium, 18.8% carbon,

Chemistry

1 answer:

Nina [5.8K]3 years ago

5 0

Answer:

CaC2O4

Explanation:

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Calculate the volume (in cm³) of 38.5 grams of platinum if the density of platinum is 21.5 g/cm³. Give your answer to 2 decimal

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Answer:

$\boxed {\boxed {\sf v\approx 1.79 \ cm^3}}$

Explanation:

The formula of density is:

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

If the formula is rearranged for volume, it becomes:

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

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The density is 21.5 grams per cubic centimeter.

$m=38.5 \ g \\d= 21.5 \ g/cm^3$

Substitute the values into the formula.

$v=\frac{38.5 \ g}{ 21.5 \ g/cm^3}$

Divide. Note that the grams (g) will cancel each other out.

$v=1.79069767 \ cm^3$

Round to 2 decimal places (hundredth place). The 0 in the thousandth place tells us to leave the 9 in the hundredth place.

$v\approx 1.79 \ cm^3$

The volume is about <u>1.79 cubic centimeters.</u>

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