1. At STP, how many moles of helium gas would occupy 8.00 liters? Make sure to i

Question

1. At STP, how many moles of helium gas would occupy 8.00 liters? Make sure to include the correct unit symbol with the answer choice.

2. A gas sample in a closed expandable container of initial volume is 9.34 liters was allowed to warm from 21 Celsius to 38 Celsius, at constant moles and pressure. What was its new volume. Please report the answer choice with two decimal place values and include the correct unit symbol.

3. when 3 moles of aluminum are allowed to react with an excess of chlorine gas, how many moles of aluminum chloride are produced? make sure to include the correct unit symbol with the answer choice.

4. in the chemical reaction of iron and sulfur, how many moles of iron are needed to react with 11.82 moles of sulfur? make sure to include the correct unit symbol with the answer choice. 2Fe + 3S --> Fe2S3

5. The temperature of a 710 millileter samole of gas increases from 250 kelvin to 344 kelvin. what is the final volume of the sample of gas, in milliliters, if the pressures and moles in the container is kept constant? please report the answer choice in 5 significant figures and include the correct unit symbol.

Explanation / Answer

1)

Molar volume at STP is 22.4 L

number of mol = volume / molar volume

= 8.00 / 22.4 mol

= 0.357 mol

Answer: 0.357 mol

2)

we have:

V1 = 9.34 L

T1 = 21.0 oC

= (21.0+273) K

= 294 K

T2 = 38.0 oC

= (38.0+273) K

= 311 K

we have below equation to be used:

V1/T1 = V2/T2

9.34 L / 294.0 K = V2 / 311.0 K

V2 = 9.88 L

Answer: 9.88 L

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