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Recent questions tagged atomic-and-molecular-masses

Which of the following is isomorphous with magnesium sulphate $(Mg SO_4. 7H_2O)$?

asked Mar 28, 2014 by meena.p

1 answer

The relative abundance of two isotopes of atomic weight 85 and 87 is 75% and 25% respectively.The average atomic weight of element is

asked Mar 25, 2014 by sreemathi.v

1 answer

The equivalent weight of an element is 4.Its chloride has a vapour density 59.25.Then the valency of the element is

asked Mar 21, 2014 by sreemathi.v

1 answer

The number of neutrons in dipositive zinc ion with mass number 70 is

asked Mar 21, 2014 by meena.p

1 answer

$2.76\;g$ of silver carbonate on being strongly heated yields a residue weighing.

asked Mar 21, 2014 by meena.p

1 answer

The total number of electrons in one molecule of carbon dioxide is

asked Mar 21, 2014 by meena.p

1 answer

Two elements A (atomic weight = 75) and B (atomic weight = 16) combine to yield a compound. The % by weight of A in the compound was found to be 75.08 . The formula of the compound is :

asked Jan 9, 2014 by sreemathi.v

1 answer

A compound was found to contain 5.37% nitrogen.What is the minimum molecular weight of compound?

asked Jan 9, 2014 by sreemathi.v

1 answer

The haemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by weight.The molecular weight of haemoglobin as 67,200.The numbers of iron atoms in each molecule of haemoglobin is (at wt of iron=56)

asked Jan 9, 2014 by sreemathi.v

1 answer

The % loss in weight after heating a pure sample of potassium chlorate (M wt:122.5) will be

asked Jan 8, 2014 by sreemathi.v

1 answer

The weight of slaked lime required to decompose 8.0g $NH_4Cl$ is

asked Jan 8, 2014 by sreemathi.v

1 answer

Gastric juice contains 3.0g of HCl per litre.If a person produces 2.5l of gastric juice per day,how many antacid tablets each containing 400mg of $Al(OH)_3$ are needed to neutralized all the HCl produced in one day ?

asked Nov 6, 2013 by sreemathi.v

1 answer

A plant virus is found to consist of uniform cylindrical particles of 150A in diameter and 5000A long.The specific volume of the virus is $0.75cm^3/g$.If the virus is considered to be a single particle and its molecular weight

asked Oct 30, 2013 by sreemathi.v

1 answer

Haemoglobin $(C_{2952}H_{9664}N_{812}O_{832}S_8Fe_4)$ is oxygen carrier. If a person has $5L$ blood and each mL of blood has $5\times 10^9$ R.B.C and each R.B.C has $2.8\times 10^8$ haemoglobin molecules, then how many grams of haemoglobin is present in the body of that person?

asked Oct 25, 2013 by sreemathi.v

1 answer

The oxide of an element contains 32.33 percent of the element and the vapor density of its chloride is 79.Calculate the atomic mass of the element.

asked Oct 23, 2013 by sreemathi.v

1 answer

One gram of a chloride was found to contain 0.835g of chlorine.Its vapor density is 85.Calculate its molecular formula

asked Oct 23, 2013 by sreemathi.v

1 answer

On dissolving 2.0g of metal in sulphuric acid 4.51g of the metal sulphate was formed.The specific heat of the metal is 0.057cal/g.What is the exact atomic mass of the metal?

asked Oct 23, 2013 by sreemathi.v

1 answer

A chloride of an element contains 49.5% chlorine.The specific heat of the element is $0.056$.Calcuate the equivalent mass,valency.

asked Oct 23, 2013 by sreemathi.v

1 answer

The equivalent weight of a metal is double than that of oxygen .How many times is the weight of its oxide greater than the weight of metal?

asked Oct 23, 2013 by sreemathi.v

1 answer

The percentage of an element $m$ is 53 in its oxide of molecular formula $M_2O_3$.Its atomic mass is about

asked Oct 23, 2013 by sreemathi.v

1 answer

A metal m of equivalent mass E forms an oxide of molecular formula $M_xO_y$ .The atomic mass of the metal is given by the correct equation.

asked Oct 23, 2013 by sreemathi.v

1 answer

Insulin contains 3.4% sulphur.Then the minimum molecular mass of the insulin is about

asked Oct 22, 2013 by sreemathi.v

2 answers

An unknown element forms an oxide.What will be the equivalent mass of the element if the oxygen content is 20% by mass ?

asked Oct 22, 2013 by sreemathi.v

1 answer

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