a Error-Fall 2015-ST Q, LON-CAPA Six Balance Chemical board Learn b 5c × Balance

Question

a Error-Fall 2015-ST Q, LON-CAPA Six Balance Chemical board Learn b 5c × Balance Chemical 0 lon-capa uiuc edu/res/uucdnillsCHEM 101/Lab3/Stoich access 1 03 problemsymb 1515837 Suppose you react 14.48 grams of MnO2 according to the following (unbalanced) equation: 1. How many moles of manganese(IV) oxide do you have? mol MnO2 Sent bam Tres o/s Subeit Answer Tries 0/5 2. How many moles of HCl do you need for a complete reaction? mol HC Submit Answer Tries 0/5 3. How many grams of HCl do you need for a complete reaction? 9 HCI Submit Answer Tries 0/5 4. How many grams of each product do you form? g Cl, Sutt Are Tries o/s Tries 0/5 5. Prove that mass has been conserved. What is the total mass present before the reaction occurs? lg total before reaction What is the total mass present after the reaction occurs? g total after reactiorn

Explanation / Answer

1.

molecular weight of MnO2 is nearly= 87 g

weight available=14.48 g

no. of moles=14.48/87=0.166 moles

2.

as the stochiom2tric coefficient of HCl and MnO2 are equal, same no. of moles of HCl are req, i.e=0.166 moles

3.

molecular weight of HCl=36.46 g

weight of given no. of moles=0.166*36.46=6.07 g

4.

as stochiometric coeff. is 1 for all same no. of moles are produced.

molecular weight of H2O=18 g.

weight produced=0.166*18=2.988 g

molecular weight of MnCl2=125.844 g.

weight produced=0.166*125.844=20.831 g

molecular weight of Cl2=70.91 g.

weight produced=0.166*70.91=11.771 g

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