Answer:
2Na2O2+2H2O⟶O2+4NaOH
2×78g 32g
156g of Na2O2 produces 32g of O2,
12g of Na2O2 produces =15632×12=10.66g.
Density of O2 at NTP=1.428g/mL.
DensityMass=Vol.
1.42810.66=7.46mL
Vol. of O2 at NTP is 7.46mL.
Explanation:
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The cells get into your body by the lungs this answer is correct cause i had the same question and my teacher mark it correct
1) determine molar mass of K₃PO₄
2) determine total mass of potassium atoms in K₃PO₄
4) divide by molar mass and multiply by 100
×
= 55.25981062% (round as you wish)
Answer:
Mass of CaCl₂ 136.9 g
Mass of water 223.4 g
Explanation:
The 38% by mass, means that the solution contains 38 g of CaCl₂ in 100 g of solution.
So, if the total mass of solution is 360.3 g let's make a rule of three to find out the mass of solute.
100 g _____ 38 g CaCl₂
360.3 g _____ (360.3 g . 38g)/ 100 g = 136.9 g of CaCl₂
Total mass of solution = 360.3 g → Mass of solvent + Mass of solute
360.3 g = Mass of solvent + 136.9 g
360.3 g - 136.9 g = Mass of solvent → 223.4 g
Known :
r = 6 in
h = 11 in
Asked :
Volume = ...?
Answer :
V = πr²h
= 3.14 × 6² × 11
= 3.14 × 36 × 11
= 3.14 × 396
= <u>1</u><u>,</u><u>2</u><u>4</u><u>3</u><u>.</u><u>4</u><u>4</u><u> </u><u>in³</u>
So, the volume is 1,243.44 in³ (2nd choice)
<em>Hope </em><em>it </em><em>helpful </em><em>and </em><em>useful </em><em>:</em><em>)</em>