A sample of iron has a mass of 1.68 g. C...

A sample of iron has a mass of 1.68 g. Calculate (a) the number of moles of iron present, (6) the number of atoms of iron in the sample

Text Solution

AI Generated Solution

To solve the problem step by step, we will calculate the number of moles of iron in the sample and then the number of atoms of iron present in that sample. ### Step 1: Calculate the number of moles of iron 1. **Identify the mass of iron**: The mass of the iron sample is given as 1.68 g. 2. **Find the atomic weight of iron (Fe)**: The atomic weight of iron is approximately 56 g/mol. 3. **Use the formula for moles**: The number of moles (n) can be calculated using the formula: \[ ...

Topper's Solved these Questions

SOME BASIC CONCEPTS OF CHEMISTRY
MODERN PUBLICATION|Exercise HIGHER ORDER THINKING SKILLS (ADVANCED LEVEL QUESTIONS WITH ANSWERS)|19 Videos
SOME BASIC CONCEPTS OF CHEMISTRY
MODERN PUBLICATION|Exercise COMPETITION FILE (MULTIPLE CHOICE QUESTIONS)|30 Videos
SOME BASIC CONCEPTS OF CHEMISTRY
MODERN PUBLICATION|Exercise REVISION EXERCISES (LONG ANSWER QUESTIONS) (CARRYING 5 MARKS)|10 Videos
S-BLOCK ELEMENTS ( ALKALI AND ALKALINE EARTH METALS )
MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|13 Videos
STATES OF MATTER : GASES AND LIQUIDS
MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|13 Videos

A sample of Ammonium phosphate (NH_(4))_(3)PO_(4) contains 3.18 moles of oxygen atoms. The number of moles of oxygen atom in the sample is

0.265

0.795

1.06

3.18

A sample of ammonium phosphate, (NH_4)_3PO_4 contains 18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is

`6`

`18`

`4`

`24`

The half-life of a radioactive sample A is same as the mean life of sample B. The number of atoms present initially in both the samples is same.

After 10 days, the number of atoms is same in A and B.

A decays at a faster rate than B.

A and B decay at same rate.

The decay rate of B is greater than A.