Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). The mass and natural abundance of Si-28 are 27.9769 amu and 92.2%, respectively. The mass and natural abundance of Si-29 are 28.9765 amu and 4.67%, respectively. Find the mass and natural abundance of Si-30.

Use the mass spectrum of europium to determine the atomic mass of europium.

Use the mass spectrum of rubidium to determine the atomic mass of rubidium.

How many sulfur atoms are there in 5.52 mol of sulfur?

How many moles of aluminum do 3.7×10²⁴ aluminum atoms represent?

What is the amount, in moles, of each elemental sample? a. 11.8 g Ar b. 3.55 g Zn c. 26.1 g Ta d. 0.211 g Li

What is the mass, in grams, of each elemental sample? a. 2.3×10^–3 mol Sb b. 0.0355 mol Ba d. 1.3 mol W

What is the mass, in grams, of each elemental sample? c. 43.9 mol Xe

How many silver atoms are there in 3.78 g of silver?

What is the mass of 4.91×10²¹ platinum atoms?

Calculate the number of atoms in each sample. a. 5.18 g P

Calculate the number of atoms in each sample. a. 14.955 g Cr

Calculate the mass, in grams, of each sample. a. 1.1×10²³ gold atoms b. 2.82×10²² helium atoms

Calculate the mass, in grams, of each sample. c. 1.8×10²³ lead atoms

Calculate the mass, in grams, of each sample. d. 7.9×10²¹ uranium atoms

Calculate the mass, in kg, of each sample. a. 7.55×10²⁶ cadmium atoms b. 8.15×10²⁷ nickel atoms c. 1.22×10²⁷ manganese atoms d. 5.48×10²⁹ lithium atoms

How many carbon atoms are there in a diamond (pure carbon) with a mass of 52 mg?

How many helium atoms are there in a helium blimp containing 536 kg of helium?

Calculate the average mass, in grams, of one platinum atom.

Using scanning tunneling microscopy, scientists at IBM wrote the initials of their company with 35 individual xenon atoms (as shown below). Calculate the total mass of these letters in grams.

A 7.83 g sample of HCN contains 0.290 g of H and 4.06 g of N. Find the mass of carbon in a sample of HCN with a mass of 3.37 g.

The ratio of sulfur to oxygen by mass in SO₂ is 1.0:1.0. a. Find the ratio of sulfur to oxygen by mass in SO₃. b. Find the ratio of sulfur to oxygen by mass in S₂O.

The ratio of oxygen to carbon by mass in carbon monoxide is 1.33:1.00. Find the formula of an oxide of carbon in which the ratio by mass of oxygen to carbon is 2.00:1.00.

The ratio of the mass of a nitrogen atom to the mass of an atom of ¹²C is 7:6, and the ratio of the mass of nitrogen to oxygen in N₂O is 7:4. Find the mass of 1 mol of oxygen atoms.

An a particle, 4He2 + , has a mass of 4.00151 amu. Find the value of its charge-to-mass ratio in C/kg.

Naturally occurring iodine has an atomic mass of 126.9045 amu. A 12.3849 g sample of iodine is accidentally contaminated with an additional 1.00070 g of ¹²⁹I, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid gland. The mass of ¹²⁹I is 128.9050 amu. Find the apparent 'atomic mass' of the contaminated iodine.

Use the mass spectrum of lead to estimate the atomic mass of lead. Estimate the mass and percent intensity values from the graph to three significant figures.

Use the mass spectrum of mercury to estimate the atomic mass of mercury. Estimate the masses and percent intensity values from the graph to three significant figures.

Nuclei with the same number of neutrons but different mass numbers are called isotones. Write the symbols of four isotones of ²³⁶Th.

Fill in the blanks to complete the table. Symbol Z A Number of p_x001E_ Number of e_x001D_ Number of n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____