Determine the mass of each of the following:
(a)0.0146 mol koh
(b)10.2 mol etane, c2h6
(c)1.6 x 10-3 mol na2so4
(d)6.854 x 103 mol glucose, c6 h12 o6
(e)2.86 mol co(nh3)6 cl3

A) 0.82 g

B) 306 g

C) 0.23 g

D) g

E) 764 g

Explanation:

A) Upon consulting a periodic table one can find the atomic masses of each element present at a given molecule.

H=1.00 g/mol K=39.10 O=16.00

By adding the masses of the atoms in a molecule, we get its molecular weight.

KOH molecular mass is 1.00+39.10+16 = 56.10 g/mol

 Therefore the mass in 0.0146 mol of KOH is:

56.10 g/mol x 0.0146 mol = 0.82 g

B) Upon consulting a periodic table one can find the atomic masses of each element present at a given molecule.

H=1.00 g/mol C=12.01

By adding the masses of the atoms in a molecule, we get its molecular weight.

C2H6 molecular mass is 6x1.00+2x12.01= 30.02 g/mol

 Therefore the mass in 10.2 mol of KOH is:

30.02 g/mol x 10.2 mol = 306 g

C) Upon consulting a periodic table one can find the atomic masses of each element present at a given molecule.

Na=22.99 g/mol S=32.07 O=16.00

By adding the masses of the atoms in a molecule, we get its molecular weight.

Na2SO4 molecular mass is 2x22.99+32.07+4x16.00=142.05 g/mol

 Therefore the mass in 0.0016 mol of Na2SO4  is:

142.05 g/mol x 0.0016 mol = 0.23 g

D) Upon consulting a periodic table one can find the atomic masses of each element present at a given molecule.

H=1.00 g/mol C=12.01  O=16.00

By adding the masses of the atoms in a molecule, we get its molecular weight.

 C6H12O6 molecular mass is 16x1.00+6x12.01+6x16.00= 184.06 g/mol

 Therefore the mass in 6854 mol of C6H12O6 is:

184.06 g/mol x 6854 mol = g

E) Upon consulting a periodic table one can find the atomic masses of each element present at a given molecule.

H=1.00 g/mol Cl=35.45 g/mol Co=58.93 g/mol N=14.01 g/mol

By adding the masses of the atoms in a molecule, we get its molecular weight.

 Co(NH3)6 Cl3 molecular mass is 58.93+6x14.01+18x1.00+3x35.45=267.34 g/mol

 Therefore the mass in 2.86 mol of Co(NH3)6 Cl3 is:

267.34 g/mol x 2.86 mol = 764 g

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

its first and third is your answer i did the qustion the fourth isnt right