# Chemistry

Naturally occurring copper contains a mixture of 69.09% copper-63 (63.9298 amu) and 30.91% copper-65 (64.9278 amu). What is the average atomic mass of copper?

1. 👍
2. 👎
3. 👁
4. ℹ️
5. 🚩
1. 0.6909*63.9298 + 0.3091*64.9278 = X
Note: Check your post. I think the 63.9298 should be 62.9298.

1. 👍
2. 👎
3. ℹ️
4. 🚩
2. 63.5474

1. 👍
2. 👎
3. ℹ️
4. 🚩

## Similar Questions

1. ### use the mole quick check

1. The atomic mass is equivalent to 1/12 of the mass of a neutral atom of which element? a. gold b. hydrogen c. carbon d. oxygen 2. for an element, how does Avogadro’s number connect the atomic in the macroscopic scales? a. it

2. ### physicss

A 0.190 kg piece of copper is heated and fashioned into a bracelet. The amount of energy transferred as heat to the copper is 6.62 x 10^4 J. If the specific heat of copper is 387 J/kg x °C, what is the change in temp of the

3. ### chemistry

Two naturally occurring isotopes exist for the hypothetical element dippium. 25.0 percent of dippium atoms have a relative mass of 17.0 amu and 75.0 percent a relative mass of 21.3 amu. What is the atomic mass of dippium? Please

4. ### chemistry

One of the reactions involved in the smelting of copper sulfide ores involves copper(I) oxide and copper (I) sulfide: 2Cu2O(solid) + Cu2S(solid) ---> 6Cu(solid) + SO2(gas) Assuming that 35.00 g of copper (I) oxide is heated with

1. ### Chem

What is the volume V of a sample of 3.40mol of copper? The atomic mass of copper (Cu) is 63.5 g/mol, and the density of copper is 8.92×10^3kg/m^3?

2. ### Chemistry

When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 34.0 g copper(II) oxide is used?

3. ### Chemistry H.

Indium has two naturally occurring isotopes and an atomic mass of 114.818 amu. In- 113 has a mass of 112.904 amu and an abundance of 4.3%. What is the identity and percent abundance of indium's other isotope. I am very confused on

4. ### Physics

A copper block of mass 100g at a temperature of 150 degree celcius is dropped into a copper calorimeter of 40g containing 80g of water at 30 degree celcius. Calculate the steady final temperature of the mixture assuming no heat is

1. ### science

bornite(Cu3FeS3)is copper ore used in the production of copper.when heated,the following reaction occurs.2CuFeS3(s)+7oxygen(g)=6Cu(s)+2FeO(s)+6SO2(g)..IF 3.88 metric tons of bornite is reacted with excess oxygen and the process

2. ### chemistry

Copper used in electric wires comes in two flavors (isotopes): 63Cu and 65Cu. 63Cu has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, 65Cu, has an abundance of 30.91%. The average atomic mass between

3. ### science

FeCl3 + 3H2O → Fe(OH)3 + 3HCl Element Mass of an Atom (amu) Fe 56 Cl 35 H 1 O 16 Iron chloride and water react according to the equation shown. The table shows the atomic masses of the elements involved in the reaction. What is

4. ### science

The atomic mass of lithium is 6.94, the naturally occurring isotopes are 6Li = 6.015121 amu, and 7Li = 7.016003 amu. Determine the percent abundance of each isotope.