# .War nickels, produced from 1942-1945 are composed of 56% copper, 35% silver and 9% manganese. How many moles of each element are found in a 5.00 g nickel coin?

2 months ago

## Solution 1

Guest #10917
2 months ago
The moles  of each element  found in a 5.00 g nickel coin is calculated as below

moles =mass/molar mass

calculate the mass of each element  =% composition of element/100 x total mass of  nickel

Mn = 9/100 x5 = 0.45g
Cu=56/100 x5= 2.8 g
Ag= 35/100x5=  1.75 g
moles of each element is therefore=
Mn = 0.45g/54.94 =  8.19 x10^-3 moles

Ag=1.75g/107.87 g/mol = 0.0162 moles

Cu = 2.8 g/63.5 g/mol=0.0441  moles

## 📚 Related Questions

Question
A waxing moon means the moon is becoming a waht
Solution 1
The moon at any time after new moon and before full moon, so called because its illuminated area is increasing. ... It was a cold October evening, with a waxing moon, and a wind that was rapidly bringing the dead leaves to earth.
Question
The coordinate plane is separated into four quadrants as shown. let p: x < 0 let q: y < 0 what is represented by p ∨ q? quadrant 1 because both x and y are positive coordinates quadrant 3 because both x and y are negative coordinates quadrants 1, 2, and 4 because in these quadrants x, y, or both are positive coordinates quadrants 2, 3, and 4 because in these quadrants x, y, or both are negative coordinates
Solution 1

The correct option is C which is it is the third coordinate because p and q both are negative.

### Explanation:

If we look at the four quadrants of coordinate plane:

• Quadrant 1: If x and y both are positive.
• Quadrant 2: If x is negative and y is positive.
• Quadrant 3: If both x and y are negative.
• Quadrant 4: If x is positive and y is negative.

So according to given data, x is less than 0 means xis negative. y is also negative because y is less than 0.

So both x and y are negative and it is in quadrant 3.

Solution 2

Quadrant II, because the slope is positive and the y intercept is negative

Explanation:

Question
Which is the most likely reason why an aerosol can explodes when it is thrown into a fire
Solution 1

Heat causes the gas particles in the can to move faster and farther apart.

Solution 2
Aerosol is highly inflammable, That's why.
Question
How many atoms are present in 0.10mol of ptcl2 (nh3)2?
Solution 1
The number of atoms  present in 0.10 mol of PtCl2(NH3) is calculated using Avogadro law  formula

that is

1 mole = 6.02 x10^23 atoms
what about 0.10 moles = ? atoms

= 6..02 x10 ^23 x 0.1 = 6.02 x10^22  atoms
Solution 2

Explanation:

According to the mole concept, 1 mole of an atom contains atoms or molecules.

Therefore, we can calculate the number of atoms present in 0.10 mol of as follows.

atoms

=

=

Therefore, we can conclude that there are atoms present in 0.10 mol of .

Question
7. Which of the following is not a base? A. NaOH B. NH3 C. KOH D. H3C6H5O7
Solution 1
C. WOULD BE THE AWNSER FAM
Question
In the nuclear transmutation represented by 168o(p, \alpha) 137n, the emitted particle is ________. in the nuclear transmutation represented by o(p, \alpha) n, the emitted particle is ________. a beta particle. a proton. an alpha particle. a neutron. a positron.
Solution 1

Nuclear reaction: ¹⁶O + p⁺ → ¹³N + α (alpha particle).
Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.
When oxygen-16 gain one proton, atomic mass is 17, but when lose alpha particle atomic mass reduces by four to 13.

Question
: hydrochloric acid reacts with the mineral calcite to produce carbon dioxide gas, water, and calcium chloride. based on what you have learned in activity a and activity b, what are three things you could do to make the reaction occur more quickly?
Solution 1
Following three things when applied could make the reaction to occur more quickly;

1) Increasing Temperature:
Increase in temperature increases the Kinetic energy of molecules. This results in increase in the velocity and rate of collisions between reactants. Hence, greater the number of collisions between reactants per time greater will be the probability of formation of product per unit time.

2) Grinding Calcite:
Grinding of Calcium carbonate results in the increase of surface area of calcite. So greater the surface area greater is the exposure of Calcium carbonate to HCl molecules, hence the rate of formation of product increases.

3) Using Catalyst:
Very important. Catalyst when used decreases the activation energy and increase the rate of reaction by following methods.

a) Providing new pathway

b) weakening the bonds

c) providing surface area

d) holding up the reactant close to each other.
Solution 2

The things that can be done to make the reaction occur quickly include increasing the temperature, grinding calcite, and using catalyst.

• It should be noted that a catalyst is used to speed up the rate of a chemical reaction. Also, increasing the temperature is important in increasing the kinetic energy of the molecules.

• Furthermore, it should be noted that grinding calcite results in the rise in the surface area of the calcite. Therefore, the formation of product will rise.

In conclusion, these are important in making hydrochloric acid react with the mineral calcite quickly.

brainly.com/question/16416932

Question
A mixture of 100 g of k2cr207 and 200 g of water is stirred at 60 °c until no more of the salt dissolves. the resulting solution is poured off, leaving the undissolved solid behind. the solution is now cooled to 20°c. what mass of k2cr207 crystallizes from the solution during the cooling?
Solution 1
One example of a solution is salt water which is a mixture of water and salt. You cannot see the salt and the salt and water will stay a solution if left alone. Parts of aSolution. Solute - The solute is the substance that is being dissolved by another substance.
Question
At 350°c, keq = 1.67 × 10-2 for the reversible reaction 2hi (g) ⇌ h2 (g) + i2 (g). what is the concentration of hi at equilibrium if [ h2 ] is 2.44 × 10-3 m and [ i2 ] is 7.18 × 10-5 m?
Solution 1
According to the reversible reaction equation:

2Hi(g) ↔ H2(g) + i2(g)

and when Keq is the concentration of the products / the concentration of the reactants.

Keq = [H2][i2]/[Hi]^2

when we have Keq = 1.67 x 10^-2

[H2] = 2.44 x 10^-3

[i2] = 7.18 x 10^-5

so, by substitution:

1.67 x 10^-2 = (2.44 x 10^-3)*(7.18x10^-5)/[Hi]^2

∴[Hi] = 0.0033 M
Question
According to the valence bond theory the triple bond in ethyne consists of
Solution 1
According to the valence bond theory the triple bond in ethyne consists of one sigma bond and two pi bonds.

Explanation:
Atomic number of carbon is 6. The ground state electronic configuration of carbon is as follow,

1s
², 2s², 2p²

And the excited state electronic configuration of carbon is as follow,

1s², 2s¹, 2px¹, 2py¹, 2pz¹

In ethyne the 2s¹ orbital and 2px¹ orbitals having unpaired electrons form sigma bonds by head to head overlapping with orbitals of hydrogen atom and carbon atom. The remaining 2py¹ and 2pz¹ orbitals of both carbons overlap perpendicular to the existing sigma bond resulting in the formation of two pi bonds.

2647929
842281
748681
586256
406852
368373
348603
324927
199835
130075
112100
106146
77164
23213
22589
19607
17108
13966
10987
3389