## Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) with aqueous hydrochloric acid according to the reaction

Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) with aqueous hydrochloric acid according to the reaction 4HCl(aq)+MnO2(l)+MnCl2(aq)+Cl2(g) How many grams of HCl react with 5.0 g of manganese dioxide?

## Calcium carbonate reacts with aqueous HCl to given CaCl2 and CO2 according to the reaction, CaCO3(s)+2HCl(aq)→CaCl2(g)+CO2(g)+H2Ol

Calcium carbonate reacts with aqueous HCl to given CaCl2 and CO2 according to the reaction, CaCO3(s)+2HCl(aq)→CaCl2(g)+CO2(g)+H2Ol What mass of CaCO3 is required to react completely with 25 mL of 0.75 M HCl?

## A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen  gives 3.38 g carbon dioxide, 0.690 g water and no other products. A volume of 10.0 L  (measured at STP) of this welding gas is found to weigh 11.6 g. Calculate (i) empirical  formula, (ii) molar mass of the gas, and (iii) molecular formula.

A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen  gives 3.38 g carbon dioxide, 0.690 g water and no other products. A volume of 10.0 L  (measured at STP) of this welding gas is Read More …

## Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He.

Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He.

## Use the data given in the following table to calculate the molar mass of naturally occurring  argon isotopes: Isotope    Isotopic molar mass   Abundance

Use the data given in the following table to calculate the molar mass of naturally occurring  argon isotopes: Isotope                    Isotopic molar mass                    Read More …

## How many significant figures should be present in the answer of the following calculations? (i)=(02856×298.15×0.112/0.5785)

How many significant figures should be present in the answer of the following calculations? (i)=(02856×298.15×0.112/0.5785)       (ii) 5 × 5.364  (iii)0.0125 + 0.7864 + 0.0215

## What will be the mass of one 12C atom in g?

What will be the mass of one 12C atom in g?

## Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040 (assume the density of water to be one).

Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040 (assume the density of water to be one).

## Which one of the following will have largest number of atoms? (i) 1 g Au (s)

Which one of the following will have largest number of atoms? (i) 1 g Au (s) (ii) 1 g Na (s) (iii)1 g li (s) (iv) 1 g of CI2(g)

## Convert the following into basic units: (i) 28.7 pm

Convert the following into basic units: (i) 28.7 pm (ii) 15.15 pm (iii)25365 mg

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