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Answer:
Explanation:
Temperature of gas in absolute scale T = 25 + 273 = 298 .
pressure of gas P = 1.013 x 10⁵ N / m²
density D = 1.799 kg / m³
= 1799 g / m³
From gas formula
PV / T = n R Where P is pressure , V is volume and T is absolute temperature , n is no of moles
P / T = n R / V
P / T = m R /M V where m is mass of gas and M is molecular weight .
m / V = D ( density )
P / T = DR/ M
PM / DT = R
Putting the values
1.013 x 10⁵ x 44 / (1799 x 298)
R = 8.314.09 J / K mole
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Answer:
Moisture content in wet basis = 47.4 %
Explanation:
Moisture content expresses the amount of water present in a moist sample.Dry basis and wet basis are widely used to express moisture content.
The next equation express the moisture content in wet basis:
where, : moisture content in wet basis and
: moisture content in dry basis
We now calculate the moisture content in wet basis:
= 0.474 = 47.4 % wet basis
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Answer:
- 83g
Explanation:
1, Formula
- Mass percent = (mass of solute/mass of solution) × 100
2. Determine mass of solution
Substitute the data and clear the mass of solution:
- 3.5 = (3.0g / mass of solution) × 100
- 0.035 = 3.0g / mass of solution
- mass of solution = 3.0 g / 0.035
- mass of solution = 85.714g
3. Determine the mass of solvent:
- mass of solvent = mass of solution - mass of solute
- mass of solvent = 85.714g - 3.0g = 82.714g
Round to two significant figures: 83 g
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Answer:
Endangered. The meaning of endangered is when a species declines in number- this might be because they are being eaten by another animal which has a higher popupayion, or perhaps because they are being hunted by humans for their meat or fur. Neither reason might be that their food or habitat has been destroyed b humans to create land for farming or housing. one example of name endangered species is Polar Bears: they like in the Antarctic where there is no land, simply ice. Due to humans causing climate change, the world is warming up and the ice is melting. This means polar bears are dying out because it would be too tiring to swim to find ice. For the same reason, other animals are dying in the Antarctic meaning that Poplar Bears have less to eat (being at the top of the food chain -no animal eats polar bears).
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The mass of hydrogen gas obtained is 0.068 g of hydrogen gas.
The equation of the reaction is;
Ca(s) +2H2O(l) →Ca(OH)2(aq) + H2(g)
We have to obtain the number of moles of hydrogen gas produced using the information in the question.
P = 988mmHg - 17.54 mmHg = 1.28 atm
V = 641 mL or 0.641 L
T = 20 + 273 = 293 K
n = ?
R = 0.082 atmLK-1mol-1
From;
PV = nRT
n = PV/RT
n = 1.28 atm × 0.641 L/ 0.082 atmLK-1mol-1 × 293 K
n = 0.82/24.026
n = 0.034 moles
Mass of hydrogen = 0.034 moles × 2 g/mol = 0.068 g of hydrogen gas
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Answer:
There is 0.0677 grams of H2 gas obtained
Explanation:
Step 1: Data given
The total pressure (988 mmHg) is the sum of the pressure of the collected hydrogen + the vapor pressure of water (17.54 mmHg).
ptotal = p(H2)+ p(H2O)
p(H2) = ptotal - pH2O = 988 mmHg - 17.54 mmHg = 970.46 mmHg
Step 2: Calculate moles of H2 gas
Use the ideal gas law to calculate the moles of H2 gas
PV = nRT
n = PV / RT
⇒ with p = pressure of H2 in atm = 970.46 mmHg * (1 atm /760 mmHg) = 1.277 atm
⇒ V = volume of H2 in L = 641 mL x (1 L / 1000 mL) = 0.641 L
⇒ n = the number of moles of H2 = TO BE DETERMINED
⇒ R = the gas constant = 0.08206 L*atm/K*mol
⇒ T = the temperature = 20.0 °C = 293.15 Kelvin
n = (1.277)(0.641) / (0.08206)(298.15) = 0.0335 moles H2
Step 3: Calculate mass of H2
Mass of H2 = moles H2 ¨molar H2
0.0335 moles H2 * 2.02 g/mol H2 = 0.0677g H2
There is 0.0677 grams of H2 gas obtained