No, if H2O is separated into H2 and O, then it is not the same substance
Answer:
Displacement is the direction from the starting point and the length of a directly line from the starting point to the ending point.
A layer that surrounds the earth :)
Answer:
CH
Explanation:
Polystyrene is composed only by C and H.
We can <u>calculate the number of C moles contained in the original sample mass</u> (0.00215 g), using <em>the produced mass of CO₂</em>:
- 0.00726 g CO₂ ÷ 44 g/mol = 1.65x10⁻⁴ mol CO₂
As 1.65x10⁻⁴ moles of CO₂ were produced, in the polystyrene sample there were 1.65x10⁻⁴ moles of C.
Now we <u>calculate how many moles of H₂O were produced</u>:
- 0.00148 g H₂O ÷ 18 g/mol = 8.22x10⁻⁵ mol H₂O
The number of H moles produced is double the amount of H₂O moles, so in the polystyrene sample there were 1.64x10⁻⁴ moles of H.
<em>The number of C and H moles are the same</em>, this means the empirical formula is CH.
Answer: 448 mL of hydrogen gas.
Solution:
Now,according to reaction
1 mole of magnesium produces one mole of hydrogen gas.
Then 0.020 moles of magnesium will produce 0.020 moles of hydrogen gas.
Moles of gas : 0.020 mol
At STP, 1 mol of gas occupies 22.4 L
So volume of 0.020 mol of produced at STP :
= 22.4/times 0.020 = 0.448 L = 448 mL (1L=1000mL)