An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number?

A chemist measures the amount of fluorine gas produced during an experiment. He finds that 482. g of fluorine gas is produced. Calculate the number of moles of fluorine gas produced. Be sure your answer has the correct number of significant digits.

Which method can you use to investigate the compressibility of a gas? mix it with another gas increase the pressure on it add heat to it transfer it to a larger container

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O how many moles of ethane (C2H6) are required to produce 13.5 moles of water from the above reaction?

Consider a balloon with volume V. It contains n moles of gas and has an internal pressure of P. The temperature of the gas is T. The balloon is placed in a freezer at temperature 0.75T. The freezer is pressurized at 1.25P.

What is the energy of a photon of infrared radiation with a frequency of 2.53 * 1012 Hz? Planck's constant is 6.63 * 10-34 J • s. A. 1.68 * 1023 J B. 1.68 * 1047 J C. 1.68 * 10-21 J D. 1.68 * 10-45 J

Do all liquids freeze at the same rate

Convert 1.67 x10^24 atoms of carbon to moles of carbon

The knowledge of chemistry not important in one of the following? A, in agriculture B, in Geology C, in medicine D, none

Which is the balanced equation for: Al2O3 + Fe - Fe3O4 + AL

Why are lab apparatus made of ceramics