Answer:
A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.
Explanation:
Answer:
Explanation:
7 carbon atoms, 6 hydrogen atoms,9 NO2 atoms
7+6+9=22
2(22)=44
44 atoms
Answer:
s
Explanation:
1- Wood
2-Moon
3-Pure water
4-Sand and water
5-Glass
6-Paper
7-Sun
8-Flashlights
9-Glass or polished metal
If you don't like my examples then sorry
Atomic mass carbon = 12.0 amu
1 mole C ---------- 12.0 g
?? moles C ------- 6.8 g
moles C = 6.8 x 1 / 12.0
moles C = 6.8 / 12.0
=> 0.567 moles
Answer:
Mass = 182.4 g
Explanation:
Given data:
Number of moles of Al₂O₃ = 3.80 mol
Mass of oxygen required = ?
Solution:
Chemical equation:
4Al + 3O₂ → 2Al₂O₃
Now we will compare the moles of aluminum oxide and oxygen.
Al₂O₃ : O₂
2 : 3
3.80 : 3/2×3.80 = 5.7
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 5.7 mol × 32 g/mol
Mass = 182.4 g