A sample of carbon (C) contains 4.74× 1021 C atoms. How many moles of carbon are present in the sample?

how many moles are in 46.5 g of pure aluminum and how many atoms are in 46.5 g of pure aluminum?

What quantity in moles of potassium atoms do you have if you have 3.50 x 1022 atoms of potassium. (The mass of one mole of potassium is 39.10 g.)

A sample of nitrogen has a mass of 30.2 grams. How many N atoms are there in the sample? How many N molecules are there in the sample?

Calculate the number of grams of lead contain 1.2 x 1024 atoms of lead.

13.0 g of titanium reacted with 60.0 g of bromine. In this reaction, assuming 100% yield, 69.0 g of titanium(IV) bromide were produced and 4.01 g of titanium were left after the reaction. Which reactant was the limiting reactant? Which reactant was the excess reactant? Explain your reasoning using complete sentences.

Convert 1.29 × 10^24 atoms of carbon to moles of carbon.

A 3.000 g sample of a gaseous compound was found to contain 2.560 g of carbon and 0.440 g of hydrogen. A) What is the simplest formula of the compound (Write C first and then H)? You won't be able to make the numbers a subscript. For instance, for MgCl2 enter MgCl2. B) The molar mass of the compound was found to be 42.08 g/mol. What is the molecular formula of the compound? You won't be able to make the numbers a subscript. For instance, for MgCl2 enter MgCl2.

A scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed to be XBr, where X is the unknown metal. The scientist determined that a 4.723 g sample of this compound contains 5.313 x 10-2 mol Br. Calculate the atomic mass of the unknown metal, X. atomic mass= What is the identity of the metal? Provide the name or symbol of the element. metal: MacBook Pro amu

Copper (2) fluoride contains 37.42% F by mass. use this percentage to calculate the mass of fluorine (in grams) contained in 51.5 g of copper (2) fluoride