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Problem 115 Hard Difficulty

Calculate the mass in grams of each of the following samples.
a. 3.09 moles of ammonium carbonate
b. $4.01 \times 10^{-6}$ moles of sodium hydrogen carbonate
c. 88.02 moles of carbon dioxide
d. 1.29 mmol of silver nitrate
e. 0.0024 mole of chromium(III) chloride

Answer

A.$2.97 \times 10^{2} \mathrm{g}$
B.$3.37 \times 10^{-4} \mathrm{g}$
C.$3.874 \times 10^{3} \mathrm{g}$
D.0.219 $\mathrm{g}$
E.0.38 $\mathrm{g}$

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Top Chemistry 101 Educators
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Theodore D.

Carleton College

Lizabeth T.

Numerade Educator

Stephen P.

Drexel University

Morgan S.

University of Kentucky

Video Transcript

we have five compounds listed out and with the amount of moles of each compound, and we're looking for mass. Okay, so we know the mass is equivalent to a number of malls multiplied by Mother Mass. So we have moles. All we have to do is find the molar mass and multiply those two together. All right, so first off, we have ammonium carbonate, so I am not going to have to make the molar mass of this few, but I'll explain how it's done. So we just take the molar mass of each element and added up altogether and stomach and we always thought had taken to a count the number of each element present. Yes, it's quite simple. So I've already done it. And the Momus of ammonium carbonate is 96.9 grams per mole. Yeah, right. So once we multiply that through, we get a mass of 200 and 96.9 grams. There is not a decimal over there, but right, turning 96 Gramps off ammonium company. Next off, we have sodium bicarbonate or sodium hydrogen carbonate. Right? So we have 4.1 times 10 to the negative. Six moles of Sonia, but carpeting. So the molar mass of sodium bicarbonate is 84 basically grams per mole. So once we multiplied the moles and molar mass through, we get 3.36 rounds up to 37 times 10 to the negative. Four Gramps sodium, both her opening. Next up, we have criminal toxic and 88.2 moles no multiplied by the molar mass carpet outside, which is 44.1 grams per mole. Okay, Now the product that we get this 3000 quite a large number. 3000 873 Gramps. And next up, we have Silver Knight Tree over here. Here we have 1.29 millimeters of silver nitrate, so unit conversion is required. So we're gonna multiply its quantity by the Moeller. The conversion ratio, which must be equal to one in order So we don't change what this quantity is. And Mila Mel's must be in the denominator. So it is known, but one more. It's equivalent. True. 1000 Milham ALS. So now Millie means 1000 so I could see where they got that from. All right, so Wolverton. Multiply it This smalls the's moles by the molar masses over nature, which is 169 0.87 grams per mole. No, this all send up Teoh equaling zero point 21 mine, Gramps, also for nitrate. Lastly, we have chromium correct and 2.4 times 10 to the explain negative three moles of it. Molar mass of premium chloride ISS 158 0.36 grams per mole. Well, just want to put that through to get us the product of 0.38 grams.

McMaster University
Top Chemistry 101 Educators
TD
Theodore D.

Carleton College

Lizabeth T.

Numerade Educator

Stephen P.

Drexel University

Morgan S.

University of Kentucky