## 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.

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