Question

IVJUULLIL
Chemistry
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Question 88
1.8 g of Mg is burnt in a closed vessel which contains 0.8 g of oxygen. Which of the following statements is not correct? Given; M(Mg) = 24.3 g mol​

Answer 1

Answer:

Hey mate!

Here's your answer!!

2Mg+O2= 2MgO

Here 1g of Mg is taken, so moles of Mg

= 1/24=0.041 moles

0.5 g of O2 is taken, so moles of O2

= 0.5/32= 0.01 moles

For 0.01 moles of O2, 2 × 0.01 moles of Mg are required according to Stoichiometric Coefficients.

But we have 0.041 moles, so Mg is excess reagent whereas O2 is limiting reagent.

Moles of MgO formed = Moles of O2 × 2

0.01 × 2 = 0.02 moles of MgO. Mass of MgO

= 0.02 × 24

= 0.48 g of MgO.

Answer 2

Answer:

A man standing on truck which is moving with constant velocity at 147m/s The man throws a ball in such a way

that it returns to the truck after the truck has moved 58.8m intal speed of ball is.

A 9,8 in s

6. 19.6 m/s

C.27.4 ms

D. 30 ms

E 34 4 ms

Ans: Four atoms in every 3x102

carbon atoms were '*C, 8020 yearsused to produce fibre from plants like jute, flax, hemp stalks, and also coil from coconut husks. The short and long fibres obtained after retting are used widely to manufacture paper, ropes, and wallboards.