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### (a) What is the mass, in grams, of 1.223 mol of i…

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University of New Mexico

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Problem 37

(a) What is the mass, in grams, of $2.50 \times 10^{-3}$ mol of ammonium phosphate?
(b) How many moles of chloride ions are in 0.2550 g of aluminum chloride?
(c) What is the mass, in grams, of $7.70 \times 10^{20}$ molecules of caffeine, $\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{N}_{4} \mathrm{O}_{2} ?$
(d) What is the molar mass of cholesterol if 0.00105 $\mathrm{mol}$ has a mass of 0.406 $\mathrm{g}$ ?

a) 0.373 $\mathrm{g}$
b) 5.736$\cdot 10^{-3} \mathrm{mol}$
c) 0.249 $\mathrm{g}$
d) 386.67 $\mathrm{g} / \mathrm{mol}$

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## Video Transcript

okay for option A off this question. First, we need to calculate the Moler Mosque off image for three b 04 We'll amass will be as sure three into 14 when zero for nitrogen less trail into one for high Georgian must last 30 point 97 for Force One. Why four into 16 for excision, which gives us the total Mullah Moss off 100 under than 49.6 grams? Were no. So for the calculating the mask, the mass turns out to be zero point 373 grams or option B. You need to calculate the Mullah Omar's off a l C L three witches, 26.98 grams for aluminium plus three into 35 point full 54 si il giving us the total off 133.3 crumbs were more. For though we need to calculate the moves off, they'll seal three. We just 1.913 inter tenders to four minus three moons. Next to calculate the morning off. Chlorine get O'Brien. We know that one mole off a LL sale three has three moles off glory. Negative violence. So substituting in the values. There are 5.74 into 10 days to par negative. Three moles off glory nines for the We need to go for Option C. We need to calculate the Moler mask off. See eight Edge Tim and four 02 So it into twin for carbon Bless, then into one for hydrogen plus four multiplied with 14 for nitrogen on DDE, two multiplied with 16 for oxygen, which gives us the total Mullah Moss as 194 point 80 grams formal. Now we need to calculate the mass off. See it etched 10 and four or two, which is zero point 248 Calculating the Mullah Omar's for cholesterol lists, we divide zero point 406 by 0.1 05 moments. Multiply it with one move, which gives us the Moler Moss as 386.7 grounds. That's it.