**Answer:**

**Pressure** = **73.49 atm**

**Explanation:**

The balance chemical equation is as follow,

C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

According to balanced equation,

1 mole of C₃H₈ on combustion gives = 3 moles of CO₂

So,

2 moles of C₃H₈ on combustion will give = **X** moles of CO₂

Solving for **X**,

** X** = 2 moles of C₃H₈ × 3 moles of CO₂ ÷ 1 mole of C₃H₈

** X ** = 6 moles of CO₂

Now, in second step we will calculate the the pressure exerted by CO₂ at 2.5 L volume and 373 K temperature. For this we will use Ideal gas equation assuming the gas is acting as an ideal gas. Therefore,

**Data:**

Temperature = T = 373 K

Volume = V = 2.5 L

Moles = n = 6 mol ∴ As calculated above.

Gas Constant = R = 0.0821 atm.L.mol⁻¹.K⁻¹

**Formula Used:**

** P V = n R T**

Solving for P,

P = n R T / V

Putting Values,

P = 6 mol × 0.0821 atm.L.mol⁻¹.K⁻¹ × 373 K ÷ 2.5 L

** P** = **73.49 atm**

**Answer:**

6/15 ( by cancelling with table 3 ) 2/5 ( prime factors of 5 is 5 × 1 ) so we can write 2/5 as 2/5 ×2/2 we get 4/10 and the answer is 0.4 hope it is helpful thankyou

**Explanation:**

Other brainly answer

**Answer:**

** 113 **

**Explanation:**

We are given that the atom of cadmium has 66 neutrons:

Number of neutrons in Cd = 66

Now;

Mass number = ?

The mass number of an element is the sum of the number of protons and number of neutrons

Mass number = number of protons + number of neutrons

By the position of cadmium, it has an atomic number of 47 and this is the number of protons

Mass number = 47 + 66 =** 113 **

Hello!

The reaction that took place was

**B) exothermic. **The equation for the ΔH is

To know if this reaction is

**exothermic** or

**endothermic** we will need to look at the

**sign** of the

**ΔH**. If it is

**positive**, it means that enthalpy of the products is

**higher** than the enthalpy of the reagents and the reaction is

**endothermic.**

If the sign is negative, it means that the enthalpy of the products is

**lower** than the enthalpy of the reagents and the reaction is

**exothermic**. In this case, the sign is negative, so the reaction is exothermic.

Have a nice day!

**Answer:**

87 (whatever unit its using)