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3 years ago

How many grams are 5.82 x 10^24 molecules of H2S

1 answer:

0 0

As we calculate the the no. of grams of any molecules then we should know about every method or every conversion method how we concert gram into moles and moles into gram so in this conversion method we know that 1 mole of any atoms = 6.022*1023(avogadro's#)

So 5.82*1023 / 6.022*1023 = 9.66 gram of H2S

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Calculate the wavelength and frequency of an emitted photon of gamma radiation that has energy of 2.93 × 109 J/mol

shusha [124]

Answer:

Explanation: Calculate the wavelength and frequency of an emitted photon of gamma radiation that has energy of 2.93 × 109 J/mol

6 0

4 years ago

Given that a commercial airliner has a range a range of 9,500 miles using 265 tons of JP-4 fuel. Estimate the range of the aircr

Blizzard [7]

Here is the full question.

Given that a commercial airliner has a range of 9,500 miles using 265 tonnes of JP-4 fuel. Estimate the range of the aircraft burning either gaseous or liquid hydrogen at the same mass of hydrogen as JP4.

The dry mass of the aircraft is 800 tonnes. The fuel properties are as follows:

Fuel Density (kg/m³) Heating value (kJ/kg)

JP4 800.0 45000

H₂ (gaseous, S.T.P) 0.0824 120900

H₂ (liquid, 1 atm) 70.8 120900

Answer:

25,514 mi

Explanation:

Let first calculate the value of initial mass of the aircraft $m_1$ when burning JP4 fuel by using the expression:

$m_1 =m_2 + m_{JP4}$

where;

$m_2 = 800t$

$m_{JP4} = 265t$

$m_1 = 800t+265t$

$m_1=1065 t$

We need to employ the use of the range of the airliner which can be expressed by the formula;

$s = \eta__0}(\frac{L}{\delta g})In(\frac{m_1}{m_2})(\frac{Q_R}{g})$

where;

$\eta__0}$ = overall efficiency

L = lift

$\delta g$ = drag force

$m_1 =$ initial mass of the vehicle

$m_2$ = is the final mass of the airliner after the burning of fuel

$Q_R$ = is the heat of the reaction of the fuel burning.

g = gravitational acceleration

Rearranging the above equation; we have:

$\eta__0}(\frac{L}{\delta g}) = \frac{ s}{In(\frac{m_1}{m_2})({Q_R})}$

$\eta__0}(\frac{L}{\delta g}) = \frac{9500 mi}{In(\frac{1065t}{800t})({45000 kJ/kg})}$

$\eta__0}(\frac{L}{\delta g}) = \frac{0.2111}{In(1.33)}$

$\eta__0}(\frac{L}{\delta g}) = 0.74 mi.kg/kJ$

To estimate the range of the aircraft burning either gaseous or liquid hydrogen at the same mass of hydrogen as JP4; we have:

$s = \eta__0}(\frac{L}{\delta g})In(\frac{m_1}{m_2})(\frac{Q_R}{g})$

$s= (0.74mi.kg/kJ)(120900kJ/kg)In(\frac{1065t}{800t})$

$s= (89466mi)In(\frac{1065t}{800t})$

$s = (89466mi)In(1.33)$

s = 25,513.82 mi

s ≅ 25,514 mi

Thus, the range of the aircraft when burning either gaseous or liquid hydrogen at the same mass of hydrogen as JP4 is 25,514 mi

6 0

3 years ago

2.How many neutrons does an atom of tungsten (W) have when its mass number is 185?

solniwko [45]

Answer:

110

Explanation:

3 0

3 years ago

The density of methanol is 0.787 g/ml. What is the mass in grams of 25.0 ml of methanol? Give your answer with the correct unit

Sveta_85 [38]

Answer:

19.6 g is the mass of methanol

Explanation:

Density of methanol is 0.787 g/mL.

Density means mass / volume

Methanol density = Methanol mass / Methanol volume.

Let's replace in the formula

0.787 g/mL = Methanol mass / 25 mL

0.787 g/mL . 25 mL = Methanol mass → 19.6 g

8 0

3 years ago

For the reaction A+B+C→D+E, the initial reaction rate was measured for various initial concentrations of reactants. The followin

erastovalidia [21]

Answer : The initial rate for a reaction will be $3.4\times 10^{-3}Ms^{-1}$

Explanation :

Rate law is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

For the given chemical equation:

$A+B+C\rightarrow D+E$