<h3>
Answer:</h3>
1.926 g of NaOH
<h3>
Explanation:</h3>
Concept tested: Mole and Avogadro's number
- We need to know that , 1 mole of a compound contains number of molecules equivalent to the Avogadro's number.
- Th Avogadro's number is 6.022 × 10^23
Therefore;
- 1 mole of a compound = 6.022 × 10^23 molecules
In this case; Our compound is NaOH
Therefore;
1 mole of NaOH contains 6.022 × 10^23 molecules
But; Molar mass of NaOH is 40.0 g/mol
Therefore;
- 40.0 g of NaOH contains 6.022 × 10^23 molecules
With this we can calculate the mass of 2.90 × 10^22 molecules
- Mass of a compound = (number of molecules ÷ Avogadro's constant) × molar mass
Therefore;
Mass of NaOH =(2.90 × 10^22 molecules ÷ 6.022 × 10^23 molecules)40g
= 1.9263 g
= 1.926 g NaOH
Thus, the mass of NaOH is 1.926 g
The reaction is exothermic, the energy in the bonds has been released to the surroundings (causing the potential energy to go down). The increase in energy in the surrounding heats them up hence exothermic.
Explanation:
First, let's convert 481 mmHg to atm:
1 atm --- 760 mmHg
x atm --- 481 mmHg
x = 0.63 atm
mmHg to Torr:
1 mmHg ---- 1 Torr
481 mmHg --- 481 Torr
481 Torr
mmHg to inHg
1 mmHg ---- 0.039 inHg
481 mmHg ---- y inHg
y = 18.8 inHg
mmHg to Pa
1 mmHg --- 133.322 Pa
481 mmHg ---- z
z = 64,128 Pa
Answer:
0.63 atm
481 Torr
18.8 inHg
64,128 Pa
Answer: The statement, chemicals that you begin with found on the left side of the equation, describes reactant and where they are in a chemical equation.
Explanation:
An equation that includes symbolic formulas and represents chemical reaction between the substances initially present forming new substances is called a chemical equation.
For example,
Here, substances and are the reactants. Reactants in a chemical equation are always present on the left side as these are the chemicals we begin with.
Also here, is the product. Product(s) in a chemical equation are always present on the right side as these are the chemicals we end with.
Thus, we can conclude that the statement, chemicals that you begin with found on the left side of the equation, describes reactant and where they are in a chemical equation.
Answer:
Comparative- investigations show relationships that do not always indicate cause-and-effect relationships.
Experimental- investigations cannot perfectly reproduce the conditions of the natural world.
Descriptive- investigations often are not repeatable because the results may change over time.
Explanation: I just did this on edge