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erma4kov [3.2K]
3 years ago
12

How many HNO3 molecules are in 4.20 grams?

Chemistry
1 answer:
qaws [65]3 years ago
6 0

Answer: 4.01x 10 ²² molecules HNO3

Explanation: Solution attached:

Convert mass of HNO3 to moles using its molar mass.

Convert moles of HNO3 to molecules using the Avogadro's number

4.20 g HNO3 x 1 mole HNO3 / 63 g HNO3 x 6.022x10²³ molecules HNO3 / 1 mole HNO3

= 4.0X 10 ²² molecules HNO3

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Eric's father asked an engineer to survey the field behind their house. He wanted to plant some apple and pear trees there. Acco
Vsevolod [243]

Answer:

11,000 cm

Explanation:

Step 1: Given data

Width of the field (w): 17 meters

Length of the field (l): 38 meters

Step 2: Calculate the perimeter of the field

The field is a rectangle. We can find its perimeter (P) by adding its sides.

P = 2 × w + 2 × l = 2 × 17 m + 2 × 38 m = 110 m

Step 3: Convert the perimeter to centimeters

We will use the relationship 1 m = 100 cm.

110 m × (100 cm/1 m) = 11,000 cm

8 0
3 years ago
The Moon is smaller than Earth. Why does the Moon have less gravity than Earth?
ipn [44]
C is the answer the moon has less mass than earth
3 0
3 years ago
What was one important discovery that the Curies made?
Pani-rosa [81]

Answer:

C is the answer to your question

6 0
3 years ago
If the H+ in a solution is 1x10^-1 mol/L what is the OH-
damaskus [11]
PH scale is used to determine how acidic or basic a solution is.
we have been given the hydrogen ion concentration. Using this we can calculate pH,
pH = - log[H⁺]
pH = - log (1 x 10⁻¹ M)
pH = 1
using pH can calculate pOH
pH + pOH = 14
pOH = 14 - 1
pOH = 13
using pOH we can calculate the hydroxide ion concentration 
pOH = - log [OH⁻] 
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[OH⁻] = 10⁻¹³ M
hydroxide ion concentration is 10⁻¹³ M
8 0
4 years ago
What is the density of an<br> object that has a mass of<br> 120 g and volume of 5 ml?
Viktor [21]

The density of an  object ρ = 24 g/ml

<h3>Further explanation</h3>

Given

mass of an object = 120 g

volume = 5 ml

Required

The density

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}

ρ = density  

m = mass  

v = volume  

Input the value :

ρ = 120 g : 5 ml

ρ = 24 g/ml

3 0
3 years ago
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