Answer:
3.23945533x
g
Explanation:
mass of 1 atom Pt = mass of a mole of atom Pt / 6.022 x 
= 195.08/6.022 x = 3.23945533xg
<span>It is known that amu is equal to the molar mass of 1 mole of substance. Therefore,
</span>
Weight of one mole of uranium = 238 g/mol
The molar mass or molecular weight for U205 is 556 g/mol.
(238 x 2) + (16 x 5) = 556 g/mol
CI2 + 2Nal ---> 2NalCI + I2
Nal = 149.9 g/mol.
NaCI = 58.5 g/mol
2 mol Nal makes 2 mol NaCI
0.29 g Nal x ( 1 mol / 149.9 g) = 0.0019 mol NaCI
00.19 mol NaCI x ( 58.5 g / 1 mol ) 0.11 g NaCI ( 2 sig figs)
The chemical reaction that gives off 2100 Kg of heat energy has 501.9126 calories
calculation
convert KJ to calories
that is
1 KJ = 0.239006 calories
2100KJ= ? calories
by close multiplication
= (2100 kj x 0.239006)÷ 1 kj =501.9126 calories
