Molecular Mass

Q.

What is the molar mass of $\text{NaCl}$ (table salt)?

Q.

Calculate the molecular mass of $\mathrm{Co}{\left({\mathrm{NO}}_3\right)}_2.6{\mathrm{H}}_2\mathrm{O}$.

Q.

What is the atomic mass of silver?

Q.

What is the molar mass of phosphorus?

Q.

What is the molar mass of magnesium?

Q.

Find the number of molecules in 1.8 g of ${\mathrm{H}}_2\mathrm{O}.$

Q.

What is meant by saying that 'the molecular mass of oxygen is 32' ?

Q.

The mass of a molecule of water is

1. $3\times {10}^{-26}kg$
2. $3\times {10}^{-25}kg$
3. $1.5\times {10}^{-26}kg$
4. $2.5\times {10}^{-26}kg$

Q.

Calculate the molecular weight of Ammonium sulphate [(NH₄)₂SO₄]?

Q.

Percentage of Se in peroxidase anhydrous enzyme is $0.5\%$ by weight $(\mathrm{At}.\mathrm{wt}=78.4).$ What is the minimum molecular weight of peroxidase anhydrous enzyme?

Q.

What is the atomic mass of barium?

Q.

What is the mass number of zinc?

Q.

What is the molar mass of Silver nitrate?

Q. Determine the number of hydrogen atoms in 360 g of glucose.
Given, the molecular formula of glucose is C${}_6$H${}_1$${}_2$O${}_6$.

1. $2\times 6.022\times {10}^{23}$
2. $12\times 6.022\times {10}^{23}$
3. $24\times 6.022\times {10}^{23}$
4. $10\times 6.022\times {10}^{23}$

Q.

Calculate the molecular mass of ethanoic acid, $C{H}_{3}COOH$.

(Atomic masses: C = 12 u; H = 1 u; O = 16 u)

Q.

The number of Fe Atoms in 100g Haemoglobin if it contains 0.33% Fe. (Atomic Mass Of Fe=56) is-

Q.

Which of the following compounds have the largest number of molecules?

1. $36\mathrm{g}$ of water

2. $28\mathrm{g}$ of $\mathrm{CO}$

3. $46\mathrm{g}$ of ethyl alcohol

4. $54\mathrm{g}$ of nitrogen pentaoxide $\left({\mathrm{N}}_2{\mathrm{O}}_5\right)$

Q.

Calculate the molecular mass of:

Lead nitrate $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2$.

Q. How many mole of Na ions are in 20 ml of 0.40 M of Na3PO4 ?

Q.

The molecular formula of glucose is $C_6{H}_{12}{O}_6$. Calculate its molecular mass. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)

Q. Is atomic mass and mass number same?

Q.

What is the unit of relative atomic mass?

1. gm

2. amu

3. unitless

4. Kg

Q.

How many molecules of oxygen will have the same weight as 20 molecules of SO₃

Q.

Calculate the molecular masses of the following compounds:

(a) Methanol, $C{H}_{3}OH$

(b) Ethanol, $C_2{H}_{5}OH$

Q.

Calculate the molecular mass of chloroform $\left(CHC{l}_3\right)$.

(Atomic masses: C = 12 u; H = 1 u; Cl = 35.5 u)

Q.

What is the mass of 18.066 × ${10}^{23}$ molecules of carbon dioxide?

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Q.

Calculate the relative molecular masses of :

(a) $CHC{l}_3$ (b) $(N{H}_4{)}_{2}C{r}_2{O}_7$

(c) $CuS{O}_4.5H_{2}O$ (d) $(N{H}_4{)}_{2}S{O}_4$

(e) $C{H}_{3}COONa$ (f) Potassium chlorate

(g) Ammonium chloroplatinate $(N{H}_4{)}_{2}PtC{l}_6$

Q.

What is the molar mass of $\mathrm{K}$?

Q.

Calculate the number of moles present in $9\mathrm{g}$ of ethane.

Q.

Molecular weight of phenol is

1. $94.11\mathrm{g}{\mathrm{mol}}^{-1}$

2. $84.11\mathrm{g}{\mathrm{mol}}^{-1}$

3. $104.11\mathrm{g}{\mathrm{mol}}^{-1}$

4. $98\mathrm{g}{\mathrm{mol}}^{-1}$