CHEMISTRY HIGH SCHOOL

. The density of gold is 19.32 g/mL. A U.S. $5.00 gold coin has a diameter of 1.62 cm and a thickness of 0.085 cm. The price of gold is currently $53.90 per gram. What is the value of the gold in the coin. V = π r2 h.

Answers

Answer 1

Answer:

Answer:

$182 is the value of the gold in the coin

Explanation:

Diameter is 2r, the ratio of the coin is = 1.62cm / 2 = 0.81cm

Following the formula of the volume of the coin:

V = π r² h

V = π*(0.81cm)²*0.085cm

V = 0.172cm³ = mL

As the density of the gold is 19.32g/mL, the mass of 0.1752mL of gold is:

0.1752mL * (19.32g / mL) =

3.385g is the mass of the coin

As the price of the gold is $53.90 / g, the value of the gold in the coin is:

3.385g * ($53.90 / g) =

$182 is the value of the gold in the coin

Answer 2

Answer:

Final answer:

To find the value of the gold in the coin, calculate its volume using the formula for the volume of a cylinder. The value of gold in the coin is $185.37.

Explanation:

To calculate the value of gold in the coin, we need to find its volume first using the formula for volume of a cylinder:

$V = \pi r^2h.$

The radius (r) of the coin is half its diameter, so it is 0.81 cm. The height (h) is 0.085 cm. Plugging in these values, we can find the volume of the coin. Next, we calculate the mass of the gold in the coin using its density and the volume we just calculated. Finally, we multiply the mass by the price per gram of gold to find the value of the gold in the coin.

The volume of the coin is:

$V = \pi (0.81 cm)2(0.085 cm)$

= 0.178 cm3.

The mass of the gold is:

m = density x volume

= 19.32 x 0.178

= 3.443 g.

The value of the gold in the coin is the value as -

= mass x price per gram

= 3.443 g x $53.90/g

= $185.37.

Learn more about value of gold in a coin here:

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during a canoe race, a camper paddles a distance of 406 meters in 70 seconds. what's the average speed of the race?

Answers

Answer:

Average speed of the racer is 5.8 m/s.

Explanation:

Total distance covered by racer = D = 406 m

Total time taken racer= T = 70 seconds

The formula of an average speed is given by:

Average speed :

$=\frac{\text{Total distance covered}}{\text{Total time taken}}=(D)/(T)$

Average speed of the racer is:

$=(406 m)/(70 seconds)=5.8 m/s$

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Which of the following compounds are ionic compounds?CaCl2

C6H12O6

MgO

Na2O

SiO2

Answers

ionic compounds are compounds with ionic bonds, given by the exchange of electrons between a cation (positive ion) and an anion (negative ion).

ionic compounds usually consist of a metallic element and a non-metallic element.

as such, cacl2, mgo, and na2o are ionic compounds. c6h12o6 and sio2 consists of non-metallic elements only, so they do not form ionic bonds.

re: which of the following compounds are ionic compounds?
CaCI2 is an ionic compound.
C6H12O6 is a covalent compound.
MgO is an ionic compound.
Na2O is an ionic compound.
SiO2 is a covalent compound.
hope this helps

Based on the information from the movie, what can youConclude about the common chemical compound on
earth?
A
It's oxygen
B
its hydrogen gas
C
It's carbon dioxide
D
It's water