3 years ago

Calculate the number of copper atoms in a penny.

1 answer:

3 0

Since a mole of atoms contains 6.0221 x 1023 atoms, there are 2.2452 x 1022 zinc atoms and 5.9230 x 1020 copper atoms in a penny, for a total of 2.3044 x 1022 atoms in a penny. Public Domain Image, source: NASA/JPL-Caltech

You might be interested in

Liquid hexane, C6H14, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the

Usimov [2.4K]

Answer: 46.6 grams

Explanation:

$2C_6H_{14}+19O_2\rightarrow 12CO_2+14H_2O$

Given : density of hexane = 0.660 g/ml

volume of hexane = 20 ml

Mass of hexane = ${\text {density of hexane}}\times {\text {volume of hexane}}=0.660g/ml\times 20ml=13.2g$

moles of hexane = $\frac{\text {given mass}}\times {\text {molar mass}}=\frac{13.2g}{86.18g/mol}=0.15moles$

According to stoichiometry :

2 moles of hexane reacts with 19 moles of oxygen

Thus 0.14 moles hexane will react with = $\frac{19}{2}\times 0.15=1.45$ moles of oxygen

Mass of oxygen = $moles\times {\text {molar mass}}=1.45\times 32=46.6g$

Thus minimum mass of oxygen required for the complete reaction of 20.0 mL of hexane is 46.6 grams.

7 0

4 years ago

The crane dropped the 75 kg mass with velocity of 3.2m/s. Calculate the kinetic energy of the mass

denis23 [38]

Answer:

click the link

Explanation:

Download pdf

8 0

3 years ago

A hydroxide group (OH) is a component of most...

qaws [65]

Answer: bases

Explanation:

5 0

3 years ago

The energy absorbed or released when an electron is added to a gaseous atom is know as

PIT_PIT [208]

Exothermic reaction hope I helpef

6 0

3 years ago

Read 2 more answers

If a 2.8 mole sample of gas initially occupies 54 L at 3.8 atm, what is its temperature in K?

leonid [27]

Answer: 893.7K

Explanation:

From the question, we obtained the following:

V = 54L

n = 2.8moles

P = 3.8 atm

R = 0.082atm.L/mol /K

T =?

Applying the ideal gas equation, we have:

PV = nRT

T = PV /nR

T = (3.8x54)/(2.8x0.082)

T = 893.7K

7 0

3 years ago