**Remark**

The balance numbers in front of Ag and AgNO3 are both 2. That number is in moles.

**Rule:** if the moles are the same in the equation, then whatever you are given for one, will be the same for the other. So you have 0.854 moles of Ag. You will also have 0.854 moles of AgNO3

**Answer: 0.854 <<<<<**

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**Answer:**

There are 0.0305 calories in 0.128 joules

**Explanation:**

Given that,

Heat absorbed, Q = 0.128 J

We need to find the heat energy absorbed in calories.

We know that the relation between joules and calories is as follows :

1 calorie = 4.184 J

1 J = (1/4.184) J

So,

**So, there are 0.0305 calories in 0.128 joules**

The **frequency** of a wave can be calculated using the **wavelength **and and speed of light. The frequency of a wave with 225 nm is 1.33 × 10¹⁵ Hz.

<h3>What is frequency ?</h3>

**Frequency **of a wave is the number of **wave cycles** per second. It mathematically taken as the inverse of time taken to travel and it have a unit of s⁻¹ other than Hz.

The** wavelength **of an electromagnetic wave is the distance between two consecutive crests or troughs.Wavelength and frequency are in inverse relationship. For a longer wavelength the frequency will be lower.

Higher** frequency** waves are more energetic than longer wavelengths. Thus **energy** and frequency are in direct proportion

It is given that the wavelength of the electron is 225 nm. Consider the electron behaving as wave and the frequency v can be calculated using the** speed **of** light **c as follows:

= (3 ×10⁸ m/s) /(225 ×⁻⁹ m)

= 1.33 × 10¹⁵ Hz.

Hence, the **frequency** of an **electron **with a wavelength of 225 nm is 1.33 × 10¹⁵ Hz.

To find more about **frequency**, refer the link below:

brainly.com/question/14316711

#SPJ2

**Answer:**

V = 5 cm³

ρ = 4 g/cm³

**Explanation:**

**Step 1: Calculate the volume (V)**

We have a wooden cuboid of dimensions 5 cm × 1 cm × 1 cm. We can calculate its volume using the following expression.

V = 5 cm × 1 cm × 1 cm

V = 5 cm³

**Step 2: Calculate the density (ρ)**

The density is equal to the mass divided by the volume.

ρ = m / V

ρ = 20 g / 5 cm³

ρ = 4 g/cm³