How many atoms are contained in 0.25 moles of Fe

Calculate the vapor pressure (in torr) at 298 K in a solution prepared by dissolving 42.4 g of the non-volatile non-electrolye urea {CO (NH2) 2} in 195 g of ethanol. The vapor pressure of ethanol at 298 K is 58.9 torr.

Which of the following best represents and explains the formula for a compound made from carbon and hydrogen? CH4, because four electron pairs are shared between carbon and hydrogen.

The water-gas shift reaction co (g) + h2o (g) ⇌co2 (g) + h2 (g) is used industrially to produce hydrogen. the reaction enthalpy is δh∘=-41kj. to increase the equilibrium yield of hydrogen would you use high or low temperature?

N-14 = 95%, N-15 = 3%, N-16 = 2% C-12 = 98%, C-14 = 2%

Write the symbol for the monatomic ion that has a charge of 1 - and the condensed electron configuration [ne]3s23p6.

Analytical chemists can detect very small amounts of amoin acids, down to 3x10^-21 mol. how many molecules of an amino acid (mr=200) would this be?

Are Nighthowlers real and are they poisonous

An atom had a mass of 43 and it also has has 21 electrons

What is the pH of a 3.40 mM of acetic acid, 500 mL in which 50 mL of 1.00 M NaOAc has been added? Ka HOAc is 1.8 x 10-5? What percentage of the acid is dissociated?

Round 100.1 C to 1 significant figure