11th
In this category students supposed to ask questions which belong to std 11th maharashtra board Science
- What is the SI unit of amount of a substance ? Answer: The SI unit of amount of substance is the mole (symbol: mol). The mole is one of the seven SI base units. One mole is the amount of... 1
- How many particles are present in 1 mole of a substance ? The number of particles present in 1 mole is 6.022 × 10²³ It is Avogadro's number equal to 6.022×10²³ and is expressed as the symbol N_A. 1
- Calculate the molecular mass of the following in u. a. NH3 b. CH3 COOH c. C2 H5 OH A) NH_(3 ) _(molecular mass of )NH_(3 =(1 × atomic space mass space of space N ) ) + (3× atomic mass of H) =(1×14 u)+(3× 1u) =17 u B) CH_(3... 1
- How many grams does an atom of hydrogen weigh ? The weight of 1 atom of hydrogen is calculated as 1.66058 × 10⁻²⁴ grams. Explaination : we know that 1 molecule is made up of 6.023 ×10²³ at... 2
- Point out the difference between 12 g of carbon and 12 u of carbon 12 g of carbon is the molar mass of carbon and 12 u of carbon is the mass of one carbon atom since , 1u= 1 atomic mass unit =1.661 × 10⁻²⁷ k... 1
- A. State and explain Avogadro's law. In 1811, Avogadro proposed that equal volumes of all gases at the same temperature and pressure contain equal number of molecules According... 1
- 1. Choose the most correct option A sample of pure water, whatever the source always contains The answer is highlighted in question like this correct answer Answers ) Q1. Choose the most correct option A) a. 88.9 B) d. Na₂S, NaF C) a.... 1