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gavmur [86]
3 years ago
13

The following reaction is done at

Chemistry
2 answers:
sergejj [24]3 years ago
4 0

Answer : The volume of H_ gas produced is, 305.8 L

Explanation :

First we have to calculate the moles of Ca.

\text{Moles of Ca}=\frac{\text{Mass of Ca}}{\text{Molar mass of Ca}}

Molar mass of Ca = 40 g/mol

\text{Moles of Ca}=\frac{500.0g}{40g/mol}=12.5mol

Now we have to calculate the moles of H_2 gas.

The balanced chemical reaction is:

Ca(s)+2HCl(aq)\rightarrow CaCl_2(aq)+H_2(g)

From the balanced chemical reaction we conclude that,

As, 1 mole of Ca react to give 1 mole of H_2 gas

So, 12.5 mole of Ca react to give 12.5 mole of H_2 gas

Now we have to calculate the volume of H_ gas.

Using ideal gas equation:

PV=nRT

where,

P = Pressure of H_2 gas = 1.0 atm

V = Volume of H_2 gas = ?

n = number of moles H_2 = 12.5 mole

R = Gas constant = 0.0821L.atm/mol.K

T = Temperature of H_2 gas = 25^oC=273+25=298K

Putting values in above equation, we get:

1.0atm\times V=12.5mole\times (0.0821L.atm/mol.K)\times 298K

V=305.8L

Thus, the volume of H_ gas produced is, 305.8 L

bagirrra123 [75]3 years ago
3 0

Answer: 280dm3

Explanation:Please see attachment for explanation

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2 years ago
How many milliliters of sterile water for injection should be added to a vial containing 5 mg/mL of a drug to prepare a solution
jonny [76]

Answer:

7mL of sterile water is the initial amount of the concentrated solution is 3mL

Explanation:

In this problem, the vial must be <em>diluted </em>from 5mg/mL to 1.5mg/mL, that means the solution must be diluted:

5mg/mL / 1.5mg/mL = 3.33 times

If the initial amount of the drug in the vial is 3mL, the final volume must be:

10mL

That means the volume of water that should be added is:

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<h3>7mL of sterile water is the initial amount of the concentrated solution is 3mL</h3>
4 0
3 years ago
Lactic acid results from which of the following?
vazorg [7]

Explanation:

Lactic acid is formed during the breakdown of glucose. This is sometimes called "blood sugar."

7 0
3 years ago
Read 2 more answers
Water is poured into a conical container at the rate of 10 cm3/sec. The cone points directly down, and it has a height of 20 cm
8090 [49]

Answer:

\frac{dh}{dt}_{h=2cm} =\frac{40}{9\pi}\frac{cm}{2}

Explanation:

Hello,

The suitable differential equation for this case is:

\frac{dV}{dt}=10\frac{cm^3}{s}

As we're looking for the change in height with respect to the time, we need a relationship to achieve such as:

\frac{dh}{dt} = ?*\frac{dV}{dt}

Of course, ?=\frac{dh}{dV}.

Now, since the volume of a cone is V=\pi r^2h/3 and the ratio r/h=15/20=3/4 or r=3/4h, the volume becomes:

V=\pi (\frac{3}{4} h)^2h/3= \frac{3}{16}\pi h^3

We proceed to its differentiation:

\frac{dV}{dh} =\frac{9}{16} \pi h^2\\\frac{dh}{dV} =\frac{16}{9 \pi h^2}

Then, we compute \frac{dh}{dt}

\frac{dh}{dt} = \frac{16}{9 \pi h^2}*\frac{dV}{dt}\\\frac{dh}{dt} = \frac{16}{9\pi h^2}*10\frac{cm^3}{s} =\frac{160}{9 \pi h^2}

Finally, at h=2:

\frac{dh}{dt}_{h=2cm} =\frac{160}{9\pi 2^2}\\\frac{dh}{dt}_{h=2cm} =\frac{40}{9\pi}\frac{cm}{s}

Best regards.

4 0
3 years ago
An atom has 17 protons and 18 neutrons.
Wewaii [24]

Answer:

Cl

Explanation:

cl has mass number 35 and its atomic number is 17 so number of proton =atomic number 17 and number of neutron is =mass number -number of proton =35-17 =18

3 0
3 years ago
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