1. You are given 50 g of hot coffee (at 80 °C) but given that it is a hot day, you now want a cold coffee. What is the minimum amount of ice (in grams) that you must add
to cool the coffee to a temperature of 10 °C? Assume that coffee has the same specific
heat as water and neglect the heat content of the cup and heat exchanges with the
surroundings. The ice temperature is 0 °C. Given: water(3) — 37.6 J/(mol °C), Cwatert 1) =
75.4 J/mol °C), AH tus – 6.01 kJ/mol.
If the
ice comes
from a freezer at - 20 °C, would you expect to have to add more or
less ice to cool the coffee? Support your answer by doing the calculation.​

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Phosphorous acid, h3po3(aq) , is a diprotic oxyacid that is an important compound in industry and agriculture. the values of phosphorous acid are 1.30 6.70 calculate the ph for each of the given points in the titration of 50.0 ml of 1.5 m h3po3(aq) with 1.5 m koh(aq) .

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.