Home
Class 11
CHEMISTRY
If density of water is 1g/mL, then find ...

If density of water is 1g/mL, then find the number of H-atoms in 45mL water (up to 3 significannt figures).

Text Solution

Verified by Experts

mass of 45 mL water=45g [`because` density of water=1g/mL number of water molecules in 18g of water=`6.022xx10^(23)`
[`because` 1 molecule of `H_(2)O` contains 2 H-atoms]
`therefore`Number of H-atoms in 45g of water
`=(2xx6.022xx10^(23)xx45)/(18)=3.011xx10^(23)=3.01xx10^(24)`
[After rounding off up to 3 significant figures]
Promotional Banner

Topper's Solved these Questions

  • SOME BASIC CONCEPTS OF CHEMISTRY

    CHHAYA PUBLICATION|Exercise WARM UP EXERCISE|77 Videos

  • SOME BASIC CONCEPTS OF CHEMISTRY

    CHHAYA PUBLICATION|Exercise QUESTION ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)|15 Videos

  • s-BLOCK ELEMENTS

    CHHAYA PUBLICATION|Exercise PRACTICE SET|16 Videos

  • STATES OF MATTER : GASES AND LIQUIDS

    CHHAYA PUBLICATION|Exercise PRACTICE SET|10 Videos

Similar Questions

Explore conceptually related problems

Calculate the number of H & O atoms in 90 gm water at 4^@C .

What is the number of H_2 atom in 0.9 gm of water? (H = 1, O = 16)

In 240 ml dettol - water, the ratio of the volumes of water and dettol is 1 : 3 . If 60 ml of water is added to it, find the ratio of the volume of water and dettol in new mixture.

The total number of electrons in 18 mL of water (density = 1 g . mL^(-1) ) is

In 240 ml. of dettol. Water the ratio of the volumnes of water and dettol is 1 : 3 . If 60 ml. of water is added to it, Let's find the ratio of water and dettol in new mixture.

The approximate depth of an ocean is 2700 m. The compressibility of water is 45.4 times 10^-11 Pa^-1 and density of water is 10^3kg//m^3 . What fractional compression of water will be obtained at the bottom of the ocean?

There is a cavity inside a piece of metal of mass 237.3g. The apparent weight of the piece of metal immersed completely in water is 192.1gxxg . If the density of the metal is 7.91g*cm^(-3) , then find the volume of the cavity.

A body of mass 100 g has a volume of 40 cc. determine the density for the material of the body. If the density of water be 1 g/cc, then state whether the body will sink or float in water.

Find the number of hydrogen and oxygenn atoms present in 0.09 g of water.

The molarity of a NaOH solution by dissolving 4g of it in 250 ml water is