An object has a mass of 26.94 grams and a volume of 2.568 cubic centimeters. what material is it likely to be made
of?
substance
iron
gold
silver
copper
density (g/cm²)
7.874
19.32
110.49
20.93
iron
gold
silver
copper

Explanation:

Formula

density = mass / volume

Givens

mass = 26.94

volume = 2.568

Solution

density = 26.94 / 2.568

density = 10.49 grams / cc^3

Answer

This is very likely silver.

The givens in the  table except for the first 2 are wrong.

silver is as above

copper is a bit over 8.

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 :