What is the volume of 1.51 What is the volume of 1.51 times 1024 atoms of an unk

Question

What is the volume of 1.51

What is the volume of 1.51 times 1024 atoms of an unknown gas at STP? A) 0.112 L B) 2.51 L C) 8.93 L D) 56.2 L E) not enough information is given What is the mass of aluminum metal that reacts to give 1.00 g of iron? FeO(l) + Al(l) Fe(l) + Al2O3(l) A) 0.322 g B) 0.483 g C) 0.725 g D) 0.966 g E) 1.449 g What is the volume of NO gas produced from 30.0 L of nitrogen gas and 20.0 L of oxygen gas? (Assume constant conditions.)N2(g) + O2(g) 2 NO(g) A) 20.0 L B) 30.0 L C) 40.0 L D) 60.0 L E) none of the above

Explanation / Answer

Volume at STP of 1 mole= 22.4 L

Theefore

Here Volume = ((1.51*10^24)/(6.023*10^23))*22.4

= 56.2 L

D option

_3_FeO(l) + _2_Al(l) ===> _3_Fe(l) + __Al2O3(l)

2 moles of Al gives 3 moles of Fe

Here

Moles of Fe = 1/56

Therfore

Moles of Al = (2/3)*(1/56)

= 0.02 mole

Therefore

Masss = 0.019*27

= 0.483 g

B option

Volume of NO gas =2* Volume of Limiting Oxygen

=2* 20 = 40 L

C option

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