Given a mass of 70 g and a volume of 25 mL, what is the density?

The density should be 2.8 g/mL.

Explanation:

To solve this problem, we must remember that we find density using the following formula:

Density = mass/volume

Therefore, if we plug in the values we are given in the problem, we get:

Density = 70 g / 25 mL

Density = 2.8 g/mL

Therefore, the correct answer is 2.8 g/mL.

Hope this helps!

i think its 5049.

i hope this !

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2