Chemistry help please! I just need to make sure the answers correct.... Thank you!

1 answer:

8 0

1. At constant tempaerature and pressure, 3 tablets produce 600cm^3 of gas
Thus calculating for 1 tablet that produces 600 / 3 = 200 cm^3
So now two tablets produce 200 x 2 = 400 cm^3
2. We have the equation PV = nRT, n being the number of moles
Pressure P = 1,000 kPa
Volume V = 3 L
R = 8.31 L kPa/mol-K
Temperature T = 298 K
n = PV / RT = (1000 x 3) / (8.31 x 298) = 3000 / 2476.38 = 1.21 moles
Number of moles = 1.21 moles.

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A sample of dry gas weighing 2.1025 g is found to occupy 2.850 L at 22.0oC and 740.0 mm Hg. How many moles of gas are present?

soldi70 [24.7K]

0.11 moles of the gas are present in the sample of dry gas.

Explanation:

Data given:

mass of the gas = 2.1025 grams

volume of the gas = 2.850 litres

temperature = 22 degrees (273.15+22) = 295.15 K

Pressure = 740 mm Hg or 0.973 atm

moles of the gas =?

R = 0.08206 atmL/Mole K

From the ideal gas law the number of moles can be calculated in the sample of dry gas. Number of moles will be determined by the pressure exerted, volume and temperature of the gas.

The formula:

PV = nRT

n = $\frac{PV}{RT}$

putting the values in the above equation:

n = $\frac{2.850 x 0.973}{0.08206 X 295.15}$

= 0.11 moles

0.11 moles of the dry gas is present in the sample given.

4 0

3 years ago

Los átomos que no poseen _______________ son conocidos como _________________ ________________. Los átomos que poseen carga se d

irakobra [83]

Answer:

La respuesta está en la explicación

Explanation:

Los átomos que no poseen ___CARGA____ son conocidos como ____ÁTOMOS____ ____NEUTROS_____. Los átomos que poseen carga se denominan ___IONES____, aquellos con carga positiva de llaman ____PROTONES____ y son aquellos que __PIERDEN__ electrones. Los ______ANIONES____ son aquellos con carga negativa y son los que _____GANAN___ electrones. Para todos los casos el valor de _MASA__ y _NÚMERO ATÓMICO_ permanecen iguales y son los que sacamos de la tabla periódica.