One mole of particles of any substance One mole of particles of any substance On

Question

One mole of particles of any substance One mole of particles of any substance One mole of particles of any substance CL 9 Calculate the molar mass of potassium chloride, K A) 74.6 g B) 54.5 g C) 6.74 g D) 67.4 g E) 19.0 g 7) What is the molar mass of copper(I) sulfate, Cus04? A) 16.00 g B) 63.60 g C) 111.6 g D) 159.6 g B) 319.2 g 8) The molar mass of calcium hydroxide, Ca(OH)2, is A) 58.1 g. B) 57.1 g. C) 74.1 g. D) 114.2 g E) 38.0 g. 9) What is the molar mass of Mgs(PO4)2, a substance formerly used in medicine as an antacid? A)71.3 g B) 118.3 g C) 150.3 g D) 214.3 g E) 262.9 g 10) How many moles of water, H20, are present in 75.0 g H20? A) 4.41 moles B) 4.17 moles C) 75.0 moles D) 7.50 moles E) 1.35 x 103 moles 11) How many moles of K2S04 are in 15.0 g of K2S04? A) 0.172 moles B) 2.61 x 103 moles C) 0.111 moles D) 0.0861 moles E) 0.119 moles

Explanation / Answer

Answer 6 molar nass of kcl = 74.6g/mol A

Answer 7 molar mass of cuso4= 159.6g/mol D

Answer 8 molar mass of ca(oh)2=74.1g/mol C

Answer 9 molar mass of mg3(po4)2 = 262.9g/mol E

Answer 10 mole = mass/molarmass

Molarmass of water = 18g/mol

Mol= 75/18=4.17 mol B

Answer 11 molarmass of k2so4= 174.259g/mol

Mol= 15/174.259= 0.0861 mol D

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