please answer accurately. Thank !! Answer the questions in order in the blue boo

Question

please answer accurately. Thank !!

Answer the questions in order in the blue book. Where appropriate, you must show your calculations for full credit. Avogadro's number= 6.023 x 1013 particles per mol 1. Convert: (a) 0.205 kg to mg (b) 219 mm to m (c) 0,0255 L to m to L. (d) 15.50 mL 2. (a) What is the density of chromium metal if a piece weighing 15.0 g has a volume of 1.80 mL, and; (b) What is the volume of a piece of aluminum metal weighing 4.35 g? The density of Al is 2.74 g/cm 3, a) Give the no. of electrons, protons and neutrons in each of the following isotopes: i) Na-24 ii) Cr-52 iii) Br-80, and; b) Give the number of protons and electrons in: ii) N ii) S i) Ca Calculate the atomic mass of magnesium given that the metal has three naturally occurring isotopes: Mg-25 (10.00 % abundance, isotope mass-24 986 ana): Mg-24 (789 abundance, isotopic mass-23.985 amu) and Mg-2311 101 % abundance: isotopic mass- 4. 22.99 amu). s. Calculate: a) The number of calcium atoms in a 3.00 g sample of the metal, and; b) The mass of0.735 moles of N; c) The moles of cobalt in 5.53 g of the metal. 6. Give systemic names for the following compounds: a) Mgo 7. Write the formula for each of the following compounds: a) ammonium chloride b) sodium nitrate c) calcium carbonate d) diphosphorus pentoxide e) iron (II) chloride

Explanation / Answer

Ans 1 :

a) 1 kg = 106 g

So 0.205 kg = 0.205 x 106

= 205000 mg

b) 1 mm = 0.001 m

So 219 mm = 219 x 0.001

= 0.219 m

c) 1 L = 1000 mL

So 0.0255 L = 0.0255 x 1000

= 25.5 mL

d) 1 mL = 0.001 L

So 15.50 mL = 15.50 x 0.001

= 0.0155 L

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