Show your work for 2 points each. How many moles of Pb is 9.3 × 10 15atoms of Pb?

2. What is the molar mass of ethane, C2H6?

3. Find the mass of 3.65 × 10 -2mol K2SO4.

4. How many representative particles are in 2.5 mol H2O2?

5. What is the molar mass of Al2(SO4)3 ?

6. How many moles is 112 g of oxygen gas (O2) ?

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c (diamond),

sio2 (quartz)

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

you gotta add the following molecules so we can give u an answer

explanation: