Because more than one substance was released (following a color change signifying a chemical reaction), the sample was indeed, a compound.
Answer:
The average height of the sunflower sprouts at the end of week 3 is 12.0
cm.
The average height of the birch sprouts at the end of week 3 is 7.2
cm.
Explanation:
they showed it on edgu
Answer: 1.99 x 10²² molecules H2
Explanation:First we will solve for the moles of H2 using Ideal gas law PV= nRT then derive for moles ( n ).
At STP, pressure is equal to 1 atm and Temperature is 273 K.
Convert volume in mL to L:
750 mL x 1 L / 1000 mL
= 0.75 mL
n = PV/ RT
= 1 atm ( 0.75 L ) / 0.0821 L.atm/ mole.K ( 273 K)
= 3.3x10-² moles H2
Convert moles of H2 to atoms using Avogadro's Number.
3.3x10-² moles H2/ 6.022x10²³ atoms H2 / 1 mole H2
= 1.99x10²² atoms H2
