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AleksandrR [38]
3 years ago
12

The circumference of a circle is  feet. What is the length of the radius of this circle? 

Chemistry
2 answers:
pashok25 [27]3 years ago
6 0

feet equal twelve inches, 2 pie r = 12 inches if you want the radius divide twelve over 2 pie, you could also keep the one and you will have the radius in feet

telo118 [61]3 years ago
3 0

The answer isnt on the test

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Answer:

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For standard conditions (1 atm and 25°C), P/RT is 0.0409.

Concentration of 1.5% percent by volume of CO is equivalent to 1.5*10,000 ppm= 15,000 ppm CO.

The molecular weigth of CO is 28 g/mol.

(1) For 25°C and 1 atm conditions

C=(P/RT)*MW*C_{ppm}\\\\C=0.0409*28*15,000=17,178

(b) For 200°C and 1.1 atm,

P/RT=0.0409*(P/P_{std})*(T_{std}/T)\\P/RT=0.0409*(1.1atm/1atm)*(273+15K/273+200K)=0.0277

Then the concentration in mg/m3 is

C=(P/RT)*MW*C_{ppm}\\\\C=0.0277*28*15,000=11,625

5 0
3 years ago
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svetoff [14.1K]

pH is a scale used to measure the acidity or alkalinity of an aqueous solution. It can be used to calculate the amount of hydronium ions in the solution. It is expressed as the negative logarithm to the base 10 of the concentration.

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<span>pH= -log [4.5 x 10^-3]</span>

pH = 2.35

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