Sheila has 67.00 g. of Carbon (C), atomic mass 12.01 amu. How many moles of Carbon does she have?

Acylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon and 5.00 moles of helium. if the gas mixture is at stp, what is the partial pressure of the argon

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?