Question

. Find out the mass of the following.
(1). 3 moles of Na2 gas
(2). 10 moles of sodium
(3). 5 moles of calcium

plz help me guys
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Answer 1

Explanation:

14+32=46 g

3 moles of N2 gas is mass 138 g

23×10=230 g

10 moles of sodium mass 230 g

40×5=200 g

5 moles of calcium mass 200 g

Answer 2

42 g, 220 g , 200 g

Explanation:

We know that,

1 mole of any substance = molecular weight of that substance

1) 1 mole of N₂ = 14 g

 ∴ 3 moles = x g

    x = 14 × 3/1 = 42 g

2) 10 moles of Na = 10 × 22

                              = 220 g

3) 5 moles of Ca = 5 × 40

                            = 200 g