Marshall determines that a gas has a gage pressure of 276 kPa. What's the absolute pressure of this gas?

Chemistry

2 answers:

Mariana [72]3 years ago

5 0

C.... 376 tbh just took the test and was right

VladimirAG [237]3 years ago

4 0

Answer: The absolute pressure is 376 kPa.

Explanation :

The absolute pressure of a gas is defined as the sum of gauge pressure and the atmospheric pressure.

We know that the atmospheric pressure of a gas is 101.3 kPa.

So, Absolute pressure becomes 276 kPa + 101.3 kPa = 377.3 kPa

Approximately it can be written as, 376 kPa.

So, the correct option is (C) " 376 kPa ".

Hence, this is the required solution.

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4. A 0.51 kg solution contains 87 mg of potassium iodide. Calculate the W/W concentration

anzhelika [568]

Taking into account the definition of percentage composition, the percent composition of potassium iodide in this sample is 0.017%.

<h3>Definition of percent composition </h3>

The Percentage Composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.

To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.

<h3>Percentage Composition in this case</h3>

In this case, you know that a 0.51 kg (or 510000 mg, being 1 kg= 1000000 mg) solution contains 87 mg of potassium iodide.

Dividing the mass amount of potassium iodide present in the compound by the mass of the sample and multiplying it by 100 to obtain a percentage value, the percentage composition of potassium iodide is obtained:

$percentage composition of potassium iodide=\frac{87 mg}{510000 mg} x100$