Express in scientific notation (6.0x10^4) (3.1x10^-1)

The Answer is: 1.86×10^4

1.86 x 104

Explanation:

This mathematical operation is a multiplication, so:

1.- Multiply the number as usual: 6 x 3.1 = 18.6

2.- Multiply the coefficients, remember since they coefficients, a multiplication, actually you need to add them: 4 + (-1) = 3+

3.- Then you write the number with the coefficient: 18.6 x 103

4.- In this case since the scientific notation just admit one number will be:

1.86 x 104

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%

14 days is the half-life of phosphorus-32