So, in chemistry this is a homework i've had to do but never got around to doing it. i don't really understand it too well. it's conversions, and we have to show our work using factor label method (i don't even know what that is tbh). can anyone ?

Answers and explanation:

The factor label method, also known as dimentional analysis, is a way to do conversions.

To do it you use fractions with units, for example this is how you would do question one:

20 mL × = 0.02 L

Since 1L = 1000mL, we put the fraction . The litres are on top because they are the unit we want, while the mL are on the bottom so that they will cancel out. Certain questions may require more than one step of this.

We can use this same method with all the other questions:

2. 950 g × = 0.95 kg

3. 55 mm × = 0.055 m

4. 200 in × = 508 cm

5. 25 cm × = 250 mm

6. 0.005 kg × = 0.5 dag

7. 2 hrs × = 7200 s

8. 15 g × = 15000 mg

9. 1.3 yrs × × = 11388 hrs

10. 0.075 m × = 7.5 cm

one state would change   like louisiana to texas. thats a change

explanation:

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%