Dani has 15.00 grams of water (c = 4.186 ) at 66°c. she adds 40.00 grams of water at 35°c. what is the final temperature of the liquids? express the answer to the hundredths place.

43.45°C

Explanation:

The equation for the final temperature is:

T = (T1*m1 + T2*m2)/(m1 + m2)

Where:

T1 = 66 + 273.15 = 339.15 k

T2 = 35 + 273.15 = 308.15 k

(you need to convert the temperatures into kelvin degrees)

m1 = 15g

m2 = 40g

T = (15g*339.15k + 40g*308.15k)/(15g + 40g) = 316.6k

Returning to the celcius notation:

T = 316.6 - 273.15 = 43.45°C

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz

truck y has a greater velocity than truck x.