⚗️ chemistry

1. The problem states that two elements A and B are from the 1st transition series (elements with 3d electrons). 2. Element A forms an intermetallic alloy with aluminum and its max

1. **State the problem:** We have a substance that decays to 77.8% of its original amount after 300 days. We want to find:

1. The problem is to calculate the absorbance $E$ using the Lambert-Beer law given by the formula: $$E = \varepsilon \cdot c \cdot l$$

1. The problem states the molar mass $M_w = 452.36$ g/mol. 2. This value represents the mass of one mole of a substance.

1. **Problem 5: Sulfuric Acid Solution Calculations** Given: mass of H₂SO₄ = 55 g, mass of water = 350 g, density of H₂SO₄ = 1.84 g/mL

1. **Problem statement:** A 0.15 molal solution of carbonic acid (H2CO3) is prepared. We need to find: a. Molarity

1. **Problem Statement:** Analyze the distillation data to understand the relationship between temperature and distillation rate, calculate mass of distilled liquid, and interpret

1. The problem is to find the temperature in Kelvin when aluminum melts, given that aluminum melts at 660.3 degrees Celsius. 2. To convert Celsius to Kelvin, use the formula:

1. **State the problem:** We have two alcohol solutions A and B mixed in the volume ratio 1:3. The mixture's volume is doubled by adding more of solution A, making the final mixtur

1. **Exercice 1** Énoncé : Un atome d'arsenic As a un noyau contenant 42 neutrons et une charge électrique globale du noyau de $5,28 \times 10^{-18}$ C.

1. **State the problem**: We need to find the mass of one ammonia molecule and the number of such molecules in 1 gram of ammonia. 2. **Given data:**

1. **Stating the problem:** Calculate the mass of one molecule of water given the atomic masses of hydrogen and oxygen.

1. المشكلة هنا هي موازنة المعادلة الكيميائية التالية: $$\text{Al (s)} + \text{O}_2 (g) \rightarrow \text{Al}_2\text{O}_3 (s)$$

1. مشكلة: معادلة تفاعل كيميائي لموازنة المواد: $\mathrm{C_2H_6 (g) + O_2 (g) \rightarrow CO_2 (g) + Cu (s)}$. 2. نكتب العناصر: الكربون (C)، الهيدروجين (H)، والأكسجين (O).

1. **State the problem:** We are given the vapor pressure of pure water at 20°C as 17.5 atm. When 114 g of sucrose is dissolved in 1000 g of water, the vapor pressure decreases by

1. The problem lists several chemical compounds: H₂O, H₂S, NH₃, PH₃, HF, HCl, CH₄, H₂SO₄, CH₃-CH₂OH, CH₃-O-CH₃, CH₃-COOH, and H-COOH. 2. Since no specific question or mathematical

1. **Stating the problem:** We are given a table showing the relationship between burette readings and volumes in a measuring cylinder for various numbers of drops. We want to plot

1. **Menyatakan masalah:** Kita memiliki 10 sample komposisi yeast (%) dari campuran 95 kg adonan dengan 5 kg yeast setelah pencampuran selama 5 menit dan 10 menit. Kita diminta me

1. **State the problem:** We are given two hydrocarbon fuel families, Paraffins with formula $C_nH_{2n+2}$ and Cycloalkanes with formula $C_nH_{2n}$. 2. The relation between their

1. State the problem: Balance the chemical equation for the reaction between sulfuric acid and sodium hydroxide. 2. Write the unbalanced skeleton equation:

1. **State the problem:** We need to calculate the average atomic mass of neon given the isotopic distribution and their respective masses. 2. **Identify the isotopes and their abu