Home
Class 11
CHEMISTRY
Cortisone is a molecular substance conta...

Cortisone is a molecular substance containing `21` atoms of carbon per molecule. The mas percentage of carbon in cortisone is `69.98%`. Its molar mass is :

A

`176.5`

B

`252.2`

C

`287.6`

D

`360.1`

Text Solution

Verified by Experts

The correct Answer is:
D
`wt` of carbon `=21xx12 g`
`because 69.98 g` carbon contain `100 g` cortisone
`therefore 1 g` carbon contain `100 g `cortisone
`=(100)/(69.98)`
`therefore 21 xx 12 g rarr =(100)/(69.98)xx21xx12=360.10`
Promotional Banner

Similar Questions

Explore conceptually related problems

0.30 g of a substance gives 0.88 g of carbon dioxide and 0.54 g water. Calculate the percentage of carbon and hydrogen in it.

What is the simplest formula of the compound which has the following percentage composition: carbon 80%, Hydrogen 20%, If the molecular mass is 30, calcualte its molecular formula.

A vessel contains two non reactive gases : neon (monatomic) and oxygen (diatomic). The ratio of their partial pressures is 3:2. Estimate the ratio of (i) number of molecules and (ii) mass density of neon and oxygen in the vessel. Atomic mass of Ne= 20.2 u, molecular mass of O_(2) = 32.0 u .

A flask contains argon and chlorine in the ratio of 2:1 by mass. The temperature of the mixture is 27^(@)C . Obtain the ratio of (i) average kinetic energy per molecule, and (ii) root mean square speed v_("rms") of the molecules of the two gases. Atomic mass of argon =39.9 u, Molecular mass of chlorine = 70.9 u.

The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. This activity arises from the small proportion of radioactive ""_(6)^(14)C present with the stable carbon isotope ""_(6)^(12)C . When the organism is dead, its interaction with the atmosphere (which maintains the above equilibrium activity) ceases and its activity begins to drop. From the known half-life (5730 years) of ""_(6)^(14)C , and the measured activity, the age of the specimen can be approximately estimated. This is the principle of ""_(6)^(14)C dating used in archaeology. Suppose a specimen from Mohenjodaro gives an activity of 9 decays per minute per gram of carbon. Estimate the approximate age of the Indus-Valley civilisation.

An acid of molecular mass 104 contains 34.6% carbon, 3.85% hydrogen and the rest is oxygen. Calcualte the molecualr formula of the acid.

Aspartame an artificial sweetener contains 9.52 "wt". % nitrogen. There are two nitrogen atoms per molecule. What is the molecular weight of aspartame ? .

In carbon monoxide molecule distance between carbon and oxygen atom is 1.1Å . If mass of carbon atom is 12 amu and oxgyen atom is 16 amu where does the centre of mass of molecule lie?