A newly discovered element, Z, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. What is the weighted average atomic mass for this element?

Question

13-10-2016
Chemistry

contestada

A newly discovered element, Z, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. What is the weighted average atomic mass for this element?

Respuesta :

Otras preguntas

3 2d Using this formula t how much time is required for a a vehicle to travel 500m if it starts from rest and accelerates at 4.5m/s2?

3/8 + 1/8 - 2/7 + 1/4=

Hot dogs in packages of 8. Hot dogs buns in packages of 12. If Grace wants to have enough to serve 24 people and have none left over, how many packages of hot d

Help, I’m assigned to write an argumentative essay on the following topic. I need help with main ideas to argue, I have not decided to be for or against the top

Does any one know what I’m suppose to type this is for my computer class plz help Lots of points

can someone tell me if I had gotten these right or wrong?

A magic school bus travelled along this path. What is the magnitude of the total displacement of the school bus from the start to the end of its trip? (1 point

Of the American Indian cultures that lived in Georgia, the Woodland Indians were the FIRST to A.Adopt a primarily nomadic lifestyle. B.Acquire much of the food

How can the development of aptitudes be encouraged? a.positive reinforcement c. negative reinforcement b. tangible rewards d. isolation from negative influence

When you are on the roller coaster at Carowinds, your adrenal cells near the kidneys release adrenaline which then acts on the heart cells causing them to beat

Аноним Аноним · Answer 1 · 2016-10-13T15:45:39+02:00

atomic mass=percentage of isotope a * mass of isotope a + percentage of isotope b * mass of isotope b+...+percentage of isotope n * mass of isotope n.

Data:
mass of isotope₁=267.8 u
percentage of isotope₁=90.3%

mass of isotope₂=270.9 u
percentage of isotope₂=9.7%

Therefore:

atomic mass=(0.903)(267.8 u)+(0.097)(270.9 u)=
=241.8234 u + 26.2773 u≈268.1 u

Answer: the mass atomic of this element would be 268.1 u