When 0.72 g of a liquid is vaporized at 110° C and 0.967 atm, the gas occupies a volume of 0.559L. The empirical formula of the gas is CH2. what is the molecular formula of the gas?

Calculate the number of molecules in 46.0 grams of water

How many molecules are in 6.0g of sodium phosphate?

Which of the following is/are true regarding observed effects of pH on enzyme activity and rate, and the underlying causes of these effects? A.

Covalent bonds hold atoms together because they ___ Covalent bonds hold atoms together because they ___. (a) fill shells without giving atoms much charge. (b) bring electrons closer to protons.

C. If an atom has 8 protons and 10 electrons, what is the charge? What type of ion is it

Elements with the same number of shells are called? All the element that have the same number of valence electrons and have similar physical and che. ical properties are called?

How many moles are in 23.4 g

A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - -> CaSO4 + 2HF The chemist uses 11 g of CaF2 and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.

Gaps in rock layers that develop when agents of erosion remove existing rock layers

Why are atoms always neutral