Answer:
Explanation:
6.90 mol x grams
2As + 6NaOH = 2Na3AsO3 + 3H2
6 mol 2 mol
192 g/mol
6.90 mol NaOH x 2 mol Na3AsO3/6 mol NaOH== 2.3 mol Na3AsO3
2.3 mol Na3AsO3 x 192 g/mol = 442 g Na3AsO3
Answer: 36.6°C
Explanation:
Given that,
initial pressure of helium (P1) = 1.20 atm
Initial temperature (T1) = 22.0°C
Final temperature (T2) = ?
Final pressure of helium (P2) = 2.00 atm
Since pressure and temperature are given while volume is constant, apply the formula for pressure's law
P1/T1= P2/T2
1.20 atm / 22.0°C = 2.00 atm / T2
Cross multiply
1.20 atm•T2= 2.00 atm•22°C
1.20 atm•T2= 44 atm•°C
Divide both sides by 1.20 atm
1.20 atm•T2/1.20 atm = 44 atm•°C/1.20 atm
T2 = 36.6°C
The answer you selected in the picture is correct!
Place a burning splint near the opening of a test tube. If a popping noise occurs, it's probably hydrogen. Place a glowing splint in the test tube, and if it reignites, it could be oxygen. Place a burning splint into a test tube, and if it goes out, it could be carbon dioxide.
Answer:
Average weight=137 pounds=62 kg= electrons
Explanation:
First, we assume the average weight of an adult human is 137 pounds (62 kg), then we need the percentage of the mass of each element in the human body. Obtaining the molecular weight, and the number of electrons (assuming that your body is electrically neutral) per element using the periodic table. Finally, knowing that Avogadro's number represents units (electrons, atoms, protons) in one mole of any substance; we can estimate the number of electrons in the average human body (You can use your real weight to do the maths) with the equation shown below:
Where:
- is the weight body multiple by percentage of the mass of each element.
- is the molecular weight of each element.
- is the number of electrons of each element.
- is the Avogadro's number