What is the mass in grams of 0.750 moles of #C_3H_8#?

Answer 1

Well what is the mass of one mole of propane.....?

Well, it's #44.1*g#, and how did we get this?

We take the sum....#3xx12.011*g*mol^-1(C)+8xx1.00794*g*mol^-1 (H)#; from where did I get the atomic masses? Did I know them off the top of my head? Do you have to learn them?

We have got a #0.750*mol# quantity, and to get its mass we take the product......

#0.750*molxx44.1*g*mol^-1~=30*g#

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Answer 2

Jose Ayala

The mass of 0.750 moles of C3H8 is 33.9 grams.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.