16. How many grams of ammonium carbonate are needed to prepare 1.75 liners of a

Question

16. How many grams of ammonium carbonate are needed to prepare 1.75 liners of a 0.333 M solution 17. A compound is found to contain 30.51% carbon. I 60% hydrogen, and 6730% oxygen by mass and has a molecular mass of 236 g/mole. What is the molecular formula foe the compound? Answer 17 18. Calcium hydroxide, 50 mL., is titrated with 125 mL of 0.20M sulfuric acid. What is the molarity of the sodium hydroxide? Answer W18 19. A sample of gas has a mass of 2.0266 grams and occupies a volume of 500 ml. at a pressure of 798 torr and a temperature of 5°C. What is the molar mass of the gas? Answer #19 20 Oxygen (100 mL) is collected in a water filled eudiometer at 25°C and at a barometric pressure of 743 mm-Hg. What is the volume of dry oxygen gas at STP? Answer

Explanation / Answer

16)

volume , V = 1.75 L

we have below equation to be used:

number of mol,

n = Molarity * Volume

= 0.333*1.75

= 0.5827 mol

Molar mass of (NH4)2CO3 = 2*MM(N) + 8*MM(H) + 1*MM(C) + 3*MM(O)

= 2*14.01 + 8*1.008 + 1*12.01 + 3*16.0

= 96.094 g/mol

we have below equation to be used:

mass of (NH4)2CO3,

m = number of mol * molar mass

= 0.5827 mol * 96.094 g/mol

= 56 g

Answer: 56 g

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