calculate the atomic mass for Sb.

a) Bromine has 2 naturally occruing isotpoes, Br-79 and Br-81. The mass of Br-79 is 78.92 amu with a percent abundance of 50.69%. If the atomic mass of bromine is 79.904 amu, calculate the mass and percent abudance of Br-81. b) How many litres of air are in a room that measures 12.0 ft x 12.0 ft and has an 8.00 ft ceiling? (1 in= 2.54 cm (exactly); 1L = 10^3 cm^3).

For an unknown isotope ion, fill in the missing information below. Isotope symbol: I (For the isotope symbol, type in without superscripts. For example, 184w4 would be typed in as "184W4+" or "184 W 4+") Number of protons: 92 Number of neutrons: 143 Number of electrons: 88 Mass number: 235 Charge: +4

Gallium has two naturally occurring isotopes, 69Ga and 71Ga. The average atomic mass of galllium is 69.70 amu. Which of the following statements concerning the relative abundance of each isotope is correct? a) The abundance of 71Ga is greater than 69Ga. b) The abundance of 71Ga is less than 69Ga. c) The abundance of 71Ga is exactly equal to the abundance of 69Ga. d) Based on the atomic mass, only 69Ga occurs naturally. e) Not enough data is provided to determine the correct answer.

potassium has three stable isotopes k-39, k-40 and k-41 but k-40 has a very low natural abundance. which of the other two is the more abundant?

Part 1 As seen on the periodic table, the element silicon (Si) has an atomic mass of 28.086 amu. This element is composed of three naturally-occurring isotopes. The first isotope, silicon-28, has a mass of 27.977 amu and a natural abundance of 92.229%. The second isotope, silicon-30, has a mass of 29.974 amu and a natural abundance of 3.087%. What is the mass (in amu) of silicon's third isotope? write your final answer (with the correct significant figures) Part 2 Based on the answer for part 1, the name of the third isotope of silicon is ___. An atom of that particular isotope contains___ protons and ____ neutrons.

A new element has been discovered with two isotopes having masses of 84.63 amu and 90.63 amu. The average mass is 88.01 amu. Write the isotopic atomic mass that is the most abundant.

Naturally occurring neon exists as three isotopes. 90.51% is Ne-20 with a mass of 19.99 amu, O.27% is Ne-21 with a mass of 20.99 amu, and9.22% is Ne-22 with a mass of 21.99 amu. What is the atomic mass of neon? O 20.18 amu O 62.97 amu O 10.00 amu O 20.99 amu

The average atomic mass of copper is 63.546 amu. It is composed of copper-63 and copper-65 isotopes. The natural abundance of copper-63 (62.9296 amu) is 69.17%. Show how the natural abundance of copper-65 (64.9278 amu) can be determined two different ways from the given information.

Calculated the weighted average of a substance from space. It has an abundance of 30.0% and 70.0% for its two isotopes. The atomic mass for the two isotopes are 111.653amu and 113.665amu, respectively.