**Answer: A. 3.28 g of HCl**

**B. 6.30 g of **

**Explanation:**

To calculate the moles :

a)

According to stoichiometry :

1 mole of require = 1 mole of

Thus 0.09 moles of will require= of

Mass of

b)

According to stoichiometry :

1 mole of require = 2 moles of

Thus 0.05 moles of will require= of

Mass of

Given:
N2, volume of 1L of NH3 at STP
Required:
Grams of N2
Solution:
N2 + 3H2 -> 2NH3
Molar mass of N2 = 28g
From the ideal gas equation PV = nRT
n = PV/RT
n = (1 atm)(100 L)/(0.08206 L-atm/mol-K)(273K)
n = 4.46 mol of NH3
from the reaction, we need 2 moles of NH3 to get 1 mole of N2
4.46 mol NH3(1 mol N2/2 mol NH3) = 2.23 moles N2
2.23 moles of N2(28 g N2/1 mol N2) = 62.5g N2

**Answer: The partial pressure of oxygen is 76.56 atm , partial pressure of carbon dioxide is 10.44 atm and the total pressure is 87 atm.**

**Explanation:**

According to the ideal gas equation:'

P = Pressure of the gas = ?

V= Volume of the gas =

T= Temperature of the gas = 10°C = 373 K

R= Gas constant = 0.0821 atmL/K mol

n= moles of gas= 0.25 +0.034 = 0.284 moles

= mole fraction of oxygen=,

=mole fraction of carbon dioxide=

partial pressure of oxygen =

partial pressure of carbon dioxide=

**The partial pressure of oxygen is 76.56 atm , partial pressure of carbon dioxide is 10.44 atm and the total pressure is 87 atm.**

Thermal emersion circulators is what it is called

The answer is D, it controls what comes in & out the cell, well i hope so!