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## 24. Almirah was asked by her teacher to find theproduct

**Ask: **24. Almirah was asked by her teacher to find the

product of 79 and 81. Due to the unavailability of

calculators in their school, she really had hard time

to identify the product. Suddenly, Dante raised his

hand and quickly gave the answer – 6,399. How did

Dante obtain his answer easily and quickly?

He had made use the sum and difference of

two identical terms.

b. He had made use the square of binomial.

C. He had made use the cube of binomial.

d. He had made use long multiplication.

a.

Answer:

D. po

Step by step explanation

## 3. What is the commission made on a sale worth

**Ask: **3. What is the commission made on a sale worth Php2 250 with an 8%

commission rate?

4. Aya purchased a calculator worth Phpl 500. It has a 3% tax. How much

is the tax?

5. A certain bank pays 8% annual interest on time deposit. How much

interest will it pay a client at the of 3 years for an investment of

Php85 000?

**Step-by-step explanation:**

2,250 X 8% = 180

500 X 3% = 15

85,000 X 8% X 3 = 20,400

## aper. 1. How many different ways can a President and

**Ask: **aper. 1. How many different ways can a President and a Vice- president be selected for classroom officers if there are 30 students in a class? 2. In how many ways can 4 students be seated at around table? 3. How many arrangements can be made from the word CALCULATOR?

**Answer:**

Welcome to Gboard clipboard, any text that you copy will be saved here.Use the edit icon to pin, add or delete clips.Use the edit icon to pin, add or delete clips.Use the edit icon to pin, add or delete clips.Use the edit icon to pin, add or delete clips.Use the edit icon to pin, add or delete clips

## 13. How many arrangement can be made from the word

**Ask: **13. How many arrangement can be made from the word CALCULATOR?

A. 453, 600

B. 226, 800 C. 113, 400 D. 56, 700

__A. 453, 600__** ***is** **the** **answer*

## how many aranggements can be made from the word calculator

**Ask: **how many aranggements can be made from the word calculator

**Answer:**

3628800 arrangements

**Step-by-step explanation:**

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**Answer:**

388910

**Step-by-step explanation:**

Beacuse is the finish

## . Calculate how many grams of iron can be made

**Ask: **. Calculate how many grams of iron can be made from 16.5 grams of

Fe2O3 by the following equation. Fe2O3 + 3 H2 ————-> 2 Fe + 3 H2O

## Stoichiometry

### Discussion:

** Stoichiometry** is

*the quantitative study of reactants and products in a chemical reaction.*

Whether the units given for the reactants (or products) are moles, grams, liters (for gases), or some other units, we use moles to calculate the amount of product formed in a reaction. This approach is called the mole method, which means simply that the stoichiometric coefficients in a chemical equation can be interpreted as the number of moles of each substance. For example, industrial ammonia is synthesized from hydrogen and nitrogen as follows:

[tex]text{N}_{2}(g) + 3text{H}_{2}(g) → 2text{NH}_{3}(g)[/tex]

The stoichiometric coefficients show that one molecule of [tex]text{N}_{2}[/tex] reacts with three molecules of [tex]text{H}_{2}[/tex] to form two molecules of [tex]text{NH}_{3}[/tex]. It follows that the relative numbers of moles are the same as the relative number of molecules:

[tex]begin{array}{ccc} text{N}_{2} & + & 3text{H}_{2} & → & 2text{NH}_{3} \ text{1 molecule} & & text{3 molecules} & & text{2 molecules} \ 6.022 × 10^{23} : text{molecules} & & 3(6.022 × 10^{23}) : text{molecules} & & 2(6.022 × 10^{23}) : text{molecules} \ text{1 mol} & & text{3 mol} & & text{2 mol} \ end{array}[/tex]

Thus, this equation can also be read as “1 mole of [tex]text{N}_{2}[/tex] gas combines with 3 moles of [tex]text{H}_{2}[/tex] gas to form 2 moles of [tex]text{NH}_{3}[/tex] gas.” In stoichiometric calculations, we say that three moles of [tex]text{H}_{2}[/tex] are equivalent to two moles of [tex]text{NH}_{3}[/tex], that is,

[tex]text{3 mol} : text{H}_{2} bumpeq text{2 mol} : text{NH}_{3}[/tex]

where the symbol [tex]bumpeq[/tex] means “stoichiometrically equivalent to” or simply “equivalent to.” This relationship enables us to write the conversion factors

[tex]frac{text{3 mol} : text{H}_{2}}{text{2 mol} : text{NH}_{3}} : text{and} : frac{text{2 mol} : text{NH}_{3}}{text{3 mol} : text{H}_{2}}[/tex]

Similarly, we have [tex]text{1 mol} : text{N}_{2} bumpeq text{2 mol} : text{NH}_{3} : text{and} : text{1 mol} : text{N}_{2} bumpeq text{3 mol} : text{H}_{2}[/tex].

[tex]\[/tex]

### Problem:

Calculate how many grams of iron can be made from 16.5 grams of Fe₂O₃ by the following equation. Fe₂O₃ + 3 H₂ → 2 Fe + 3 H₂O

### Given:

[tex]text{mass of} : text{Fe}_{2}text{O}_{3} = text{16.5 g}[/tex]

balanced chemical equation: Fe₂O₃ + 3 H₂ → 2 Fe + 3 H₂O

### Required:

[tex]text{mass of Fe}[/tex]

### Solution:

**Step 1: Calculate the molar mass of Fe₂O₃ and Fe.**

*For **Fe₂O₃*

molar mass of Fe₂O₃ = (55.85 g/mol × 2) + (16.00 g/mol × 3)

molar mass of Fe₂O₃ = 159.7 g/mol

*For **Fe*

molar mass of Fe = 55.85 g/mol × 1

molar mass of Fe = 55.85 g/mol

**Step 2: Calculate the mass of Fe formed by using dimensional analysis (factor-label method).**

*Since* [tex]text{1 mol} : text{Fe}_{2}text{O}_{3} bumpeq text{2 mol Fe}[/tex], *the mass of Fe formed is*

[tex]text{mass of Fe} = text{16.5 g} : text{Fe}_{2}text{O}_{3} × frac{text{1 mol} : text{Fe}_{2}text{O}_{3}}{text{159.7 g} : text{Fe}_{2}text{O}_{3}} × frac{text{2 mol Fe}}{text{1 mol} : text{Fe}_{2}text{O}_{3}} × frac{text{55.85 g Fe}}{text{1 mol Fe}}[/tex]

[tex]boxed{text{mass of Fe = 11.5 g}}[/tex]

[tex]\[/tex]

#CarryOnLearning

## You just made a big progress! At this point, let

**Ask: **You just made a big progress! At this point, let us gather what you have learned by doing the activities.

How would the image appear in the microscope compared to the position of the specimen? How is magnification calculated?

pa help po nito asap

**Answer:**

It will appear inverted compared to the position of the specimen.

It is calculated by multiplication.

**Explanation:**

Example: The Eye piece has 10x magnification and the lens has 40x magnification. Then, that would be 10x×40x=400x magnification.

Hope it helps( ╹▽╹ )

## Solve the following1. Calculation of Markup Percentagegrade 7 students made

**Ask: **Solve the following

1. Calculation of Markup Percentage

grade 7 students made 25 pieces cupcakes. they sold it for 20.00per piece. they spent 15.00per piece of cupcakes. what will be the mark up pecentage? how much will be the total profit?

2. Calculate the Mark down price

Loren put 10% mark down on her Chocolate cake. the sale price is 58.5 pesos per tub. what will be the original price per tub of Chocolate cake?

**Answer:**

Their total profit is 125 pesos.

**Explanation:**

25 x 20 and 25 x 15 = 500 – 375 = 125

## 3. How many arrangements can be made from the word

**Ask: **3. How many arrangements can be made from the word CALCULATOR? 4. How many ways can 10 students line up in a food counter?

**Answer:**

3. 453600 arrangements

4. 3628800 ways

**Step-by-step explanation:**

3. The word CALCULATOR has 10 letters with 2 C’s, 2 A’s, and 2 L’s, so the number of arrangements is

10! / (2!2!2!) = 453600.

4. 10! = 3628800 ways

## How many arrangements can be made from the word CALCULATOR?a.

**Ask: **How many arrangements can be made from the word CALCULATOR?

a. 453,600 b. 553,640

c. 907,200

d. 302,400

## ✨QUESTION✨

How many arrangements can be made from the word CALCULATOR?

a. 453,600 b. 553,640

c. 907,200

d. 302,400

## ✨ANSWER✨

a. 453,600

correct me if I’m wrong

Not only you can get the answer of **how calculator is made**, you could also find the answers of Solve the following1., You just made, . Calculate how, aper. 1. How, and 3. What is.