Question

Revision garde :9

1. Calculate the Mr for following

a. HCl, b.NaNO3

2. Calculate the number of moles in 80g of MgO

3. Calculate the mass of in 10 moles of water

4. Calculate the volume occupied by

a. 0.5 moles of oxygen gas at R.T.P

b. 64 g of methane

5. Calculate the mass occupied by 3dm3 of nitogen.gas at R.T.P

6. Find the percentage composition of each element in Na2CO3.10H2O

Answer 1

Answer:

Answer: 18.25 g :)

Explanation:

By formula,

No. of moles = Given mass/ molecular mass

Molecular mass of HCl = 1+ 35.5

= 36.5

Given Moles = 0.5

Therefore, given mass = moles × mol. mass

= 0.5 × 36.5

= 18.25 g

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