1. How many atoms are in 2 moles of Iron?

2. How many atoms are in 3 moles of Lead?

3. How many atoms are in 0.75 moles of Sodium?

4. How many atoms are there in 21g of Lithium?

5. How many molecules are in 1.5 moles of CO2?

6. How many molecules of water are there in 45g of water?

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.