Answer all the questions in order in the blue book. You must show your calculati

Question

Answer all the questions in order in the blue book. You must show your calculations for full 1 . a) How many alons of lithium are there in a 5.00 g sample of the metal? .34 b) How many miolecules of chlorine are there in a 10.00 g sample of the gas? credit. R- 0.08205 L atm/(mol K) ! 6.2 uto 2 Cakeulate a) th mass of or sus t Smoltuleandthe molar masses of: (i) Chla (u) so, co- b) the mass of onc formula unit and molar masses of 3. Calculate: Cazix uo:uo (a) the moles of barium in a 15.50 g sample of the metal. 15 50g bax OMSyotox39goe 131-33se va 9800 (b) the mhs of 0.875 miol sampleof oxygen gas. Answer both parts: (a) Balance each of the following equations: 02. - mol 02 4. H2O () V/ (i) Na2CO3 (aq) +3Ct(aq) 2ael (aq) +CO2(g ) ./ (ii) H2SO4(aq) +2KOH(aq) K:SOdaq) +2,1,0() + (b) Write in the missing product in the equation below and balance the equation: 5. Consider the reaction: Ca(OH)2(aq) + 2 HCI(aq) CaCHaq) + 2H200 0 How many grams of CaClh are formed from exactly 3.500 g of Ca(OH)2 using an excess of HC1? (ii) What is meant by 'an excess of HCI? it mean wet hee b

Explanation / Answer

Ans 1

a) 1 mole of lithium has 6.022 x 1023 atoms

5.00 g = 5.00 / 6.941 = 0.72 moles

0.72 moles will have 0.72 x 6.022 x 1023

= 4.34 x 1023 atoms.

b) 10.00 of chlorine gas = 10.00 / 70.906 = 0.141 moles

1 mole has 6.022 x 1023 molecules of gas

So 0.141 moles will have 0.141 x 6.022 x 1023

= 8.5 x 1022 molecules

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.