Question

1) For the following determine the molecular weight and the molar mass. Round all mass to two decimal points. (5) Substance Melecular weight am Molar mass (g) LiP MON ZASO, Nichek) nitrate Irell) phosphate For the following mole calculations use dimensional analysis, showing the canceling of the units, and retain in your answer the number of significant figures in the measurements that is initially given to you. 2) Convert the following mass values to moles or mole values to masses. (4) a) 0.000172 gram ca b) 7:48 grams of K SO 3) Convert the following: (4) a) 3.9 moles Matos Mn b) 1.36 x 10" molecules NH,to moles of N.H 4) Convert the following: (5) a) 8.00 moles Cotolitres C at STP) c) 3530 mL SO, to moles SOSTI 5) How many grams are in 6.85 x 10 molecules of PCI? (2) 6) What is the volume (in litres) of 327 grams of NO (measured at STP)? (2) 7) How many atoms of oxygen are present in 45.9 grams of Sn(SO),? (3) 8) How many kilograms of methane (CH) are present in 5.55 x 10 mL of methane measured at STP? (6)

Answer 1

The solution for first 3 question is as follows

Substunce Molecular oelgh Molus mass Lig P 51-8 amu Mncen)2 94.96 amu 94.96 glmote ZOSoy 161-47g Imoe 161-47 am Nickeici) nitaote CNicwos 192-70gme 182-70 Camu 357-489 Imole I17o0 C1) psphorte 357 y8 amu Ca 0.000 173 a Given mass Ato mic mass ot Col l12- YgImole aiven mass Atomic mass NO 04 moles ot Col O.000172 -C =1.53 XDmole cdt53 XID6mole cd A.O.000172 GVen mass o KSaa 7-ug g Molar maSS 0Y Kso .Alo 04 moles 174225 lmoR 174 a5 0.042 mle

23 6.02 X10 cutom o 379 mole 0f Mn: 3-79x6.02x10 Ctom oy Mn aa.81X103 no oy Mn aton 23 no. o 6.02 X10 N 1 mole 0 17 602X1023 X-36X10 1-36 XI027 602X10 17 2 aa59-1 male