a=7/2-3/10
Step-by-step explanation:
20a +158+6c= 120+60+48
20a +158+6c=228
20a =228-158-6c
20a =70-6c
a= 7/2 - 3/10
Answer:
what
Step-by-step explanation:
Formula for finding percent change (increase or decrease) is amount of the change divided by the original amount.
Here, the amount of the change is 50 and the original amount is 250.
50/250= 0.2
Multiply by 100 to get percent.
20% decrease (because budget went down)
So, here you have to look at the periodic table and see what the molar mass of each molecule composing the water compound

its two hydrogen atom plus an oxygen molecule, making it about 18g per mol.
That said, looking at the mass, we have to ask ourselves, if a mol of water contains 18g of mass, how many moles do we have in 0.5g of water?
We just do a cross multiplication: