Recent content by jdhutto

Latent Heat Problem/ Phase Change...Please Help! At 1:00pm you place an ice cube tray in the freezer. Each of the 12 1-gram cubes has a temperature of 20°C. At 1:10 the water temperature has dropped to 12°C. At what time will you have ice? i have been messing around with this problem for...

i worked out .05844 mol in 1 kg for NaCL and .11098 mol in 1 kg of CaCl2 is this correct

mole fraction= amount (mol) of solute / amount (mol) of solute + amount (mol) of solven mass percent= mass of solute/ mass of solute + mass of solvent x 100 molality = amount mol of solute/ mass kg of solvent i know the equations do i just plug the quantities in or is there more to it...

Thanks yeah i should of picked that up i got that one...can you please help me with one of the others i have posted I am strugglin on those

8.46 e11 g does that sound reasonable

I have a total of 3.02 e10 moles he takes in so would i just need to convert that to grams?

I understand how to convert from moles to grams, etc I am just not sure how i would take the CO amount then throw in the amount he inhales and how many hours to figure it out.

I am really not sure...i am pretty new to chemistry and not very good at it, can i get some help

I think I understand that but what equations will help me get closer to the solution in each case?

What does u represent in these equations and i am having trouble finding time, what steps do I need to find this?

Homework Statement A solution is made by disolving 0.40 mol isopropanol (C3H7OH) in 0.70 mol water. (a) What is the mole fraction of isopropanol? (b) What is the mass percent of isopropanol? % (c) What is the molality of isopropanol? m Homework Equations...

Homework Statement Air in a smoky bar contains 4.3 10-6 mol/L of CO. What mass of CO is inhaled by a bartender who respires at a rate of 13 L/min during an 9.0 h shift? in g Homework Equations The Attempt at a Solution Can someone let me know what steps to take with...

Homework Statement "De-icing salt" is used to melt snow and ice on streets. the highway department of a small town is decideing whether to by NaCl or CaCl2 for the job. The town can obtain NaCl for $0.36/kg. What is the maximum the town should pay for CaCl2 to be cost effective? in kg...

Chem problem need help... Homework Statement How would you prepare the following aqueous solutions? (a) 1.10 kg of 0.0515 m ethanol (C2H5OH) from ethanol and water Add___ g C2H5OH to ____ g H2O. (b) 511 g of 15.0 mass % HCl from 35.3 mass % HCl Add___ g of 35.3% HCl to ___ g of water...

Homework Statement A 200kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 35.0 m/s^2 for 34.0 s, then runs out of fuel. Ignore any air resistance effects. What is the rocket's maximum altitude? How long is the rocket in the air...