Question

C A hewing b er of moles in 10 gram of CHNO3). B Number of Atoms in 25 gram of CHNO3). C Number of molecules in 100 gram of Fe(NO3). D- Number of grams in 10 % atoms of MgBr2. 2. Complete the following table: Element % Composition Empirical Formula Element . Composition empirical Formula

Answer 1

A No. d moles in 10 g do cr(NO₃)5 noleadar weight et cr(NO3) = 362 moles = mass moleader mass ho u 0.0276 moles B No. of atome in 2.5g of or (NO₂) 5. no.it moles: mass molan mass 362 I 6.906 xil moles. I mole contains 6.023 x 3 ss mdeales if it is a Compound and atom if it is an elementary partico. so, no. de molecules des cr(NO3)5 in 6.906x10 moles = 6.906x10² x 6.023x10 23 = 41.595 x 100 molecule I woleade it cr(WOB) has 1 Cr + N + 15ò = 21 atoms. Talal atoms = 21x1.595 x 100 = 8. 735x 1022 atoms/

1) No do molendes in 100g of Fe (100₂) 3. Molecular mass of te (NO3)3 - 242 moles - mass molar mass 100 Que = 0.013 moles. . & mole has 6.023 x 23 molentes Talal no. ds molecules = 0.113 x6.023x10 23 = 2.48.9x1023 molecules No. os grams in 100 atoms of Mg Bra No. do atoms in Mafra - 3 atoms ug & 2 Br in No. das moleales - 1020 - 3.33 x 100 mdecades 6.023x103 molecules 3.33x109 molecule - in 1 sole no. ds moles – 3.33x109 x1 6.023 x 1023 - 5.534 x 105 moles Molar mass das Mafia = 184 Mass (g) = moles & molar mass S.Suxio x 184 = 0.01029
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