Question

CALCULATE THE

(A) number of oxygen molecules in 8 g of oxygen gas (O2).


(B)mass of 3.011x1023 atoms of carbon.


(C) molecular mass of MgCl2 ,
Al (OH)3 , Ca (OH)2, Mg3 (PO4)2, (NH4)2 SO4.

(e) number of mole of 30 g MgSO4, 11g CO2, 9g H2O, 10g CaCO3.


( H=1, C=12, N=14, O=16, Mg=24, Al=27, P=31, S=32, Cl=35.5, Ca=40)

​

Answer 1

Answer:

A,

Explanation:

O2 =32 gm.

Here, [32\8].6.022×10 ^23

Answer 2

Answer:

(A). 32g ..........6.022×10^23 molecules of O2

8g.............Na×8/32= Na/ 4 molecules of O2

(B)6.022×10^23 atoms........12g of C

3.011×10^23 atom ..........12/2 g

= 6 g of C .

(C) 95, 88,74,. 24×3+95×2=264, 36+96 =132

respectively.

Explanation:

hope it helps u