Question 25 of 25
2 Points
Last month, Jeff wrote 9 reports. Then he got a new boss. This month, Jeff
had to write 28 reports. How many reports did Jeff write over the past two
months?
A. 47 reports
B. 9 reports
c. 19 reports
D. 37 reports

D. 37 reports

Explanation:

Last month, he wrote 9 reports, and this month he wrote 28 reports. To find how many he wrote over the past two months, add his reports from last month and this month.

last month + this month

9 reports +28 reports

37 reports

So, he wrote 37 reports, or choice D

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 :

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3