Determine the approximate density of a high-leaded brass that has a composition of 64.5 wt% cu, 33.5 wt% zn and 2.0 wt% pb. the densities of cu, zn, and pb are 8.94.7.13 and 11.35 g/cm, respectively. g/cm3 e textbook and media

The approximate density of a high-leaded brass is δ = 8,40 g/mL

Explanation:

Lead brasses are used for their high machinability and atmospheric corrosion resistance. To obtain the density of this solid solution you need to do the weighted average, thus:

δ =

δ = 8,40 g/mL

I hope it helps!

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :