Mass = mr x moles
Mr of CuCl2 = ( 63.5) + ( 35.5 x 2) = 134.5
2.5 = 134.5 x moles
2.5 / 134.5 = moles
Moles = 0.019 (2DP)
0.25g of Al
Mr of Al = 27
0.25 = 27 x moles
0.25/ 27 = 0.0093 moles (2sf)
Hope this helps :)
Answer:
Explanation:
exothermic reactions involve release of heat whereas endothermic reaction involve absorption of heat.
The relation between density and mass and volume is
![Density=\frac{Mass}{volume}](https://tex.z-dn.net/?f=Density%3D%5Cfrac%7BMass%7D%7Bvolume%7D)
the dose required is 2.5 tsp
each tsp contain 5mL
So dose required in mL = 2.5 X 5 = 12.5 mL
the mass will be calculated using following formula
![Mass=DensityXvolume](https://tex.z-dn.net/?f=Mass%3DDensityXvolume)
![Mass=1.23\frac{g}{mL}X12.5mL= 15.38g](https://tex.z-dn.net/?f=Mass%3D1.23%5Cfrac%7Bg%7D%7BmL%7DX12.5mL%3D%2015.38g)
The mass of dose in grams will be 15.38 g