50.0 mL of water at 40.5 °C is added to a calorimeter containing 50.0 mL of water at 17.4
°C. After waiting for the system to equilibrate,
the final ternperature reached is 28.3 °C.
Calculate the heat capacity of the calorimeter.
(S. H of water == 4.184 J/gX°C)?

The answer for #3 is c but i don't know why

How many moles are in 250 grams of tungsten (w)? * 4.4x10^23 moles 4.2x10^23 moles 0.7 moles 1.4 moles

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?