math
third one is 0.55
AP Chemistry
0.015 moles of a compound are dissolved in 18 fl. oz. of water. At what temperature will the solution begin to freeze? The density of water is 1.00g/mL
chemistry
CaCO3(s)+2HCl(aq)-->CaCl2(aq)+H2O(l)+CO2 (g) How many grams of calcium chloride will be produced when 31g of calcium carbonate are combined with 11 g of HCl? I have 0.3097 moles of CaCO3 and 0.30169 moles of HCl...I get stuck at that point
Chemistry
calculate the wavelength in nm of the spectral line produced when an electron in an hydrogen atom undergoes the transition from n=3 to n=2. I get 6.56x10^-7 meters and 6,561.68 nm but that is not the right answer...help please!
Physical Science Need Help Please!
A light beam has a frequency of 5 x 1015 Hz. What is its wavelength?
english
life is full of choices, so i must learn to make good ones.life is a noun choices which other one
College
Another term that means the same thing as "insurance company" is:
Calculus
y=3+2ln|x|
Calculus
y=14x+3
science
What is the amount of water needed to obtain a saturated solution using 27g of barium nitrate? What mass of water is present
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