Which can have either a positive charge or a negative charge when they are released during radioactive decay?
a. alpha particles
b. beta particles
c. positrons
d. photons

B. beta particles

Explanation:

Beta particles (β) are one of the high energy particles that are released during a radioactive decay.

Beta particles can be negatively charged  also known as electrons or positively charged  also known as positrons. These particles have a mass which is 1/2000 the mass of a proton.

Negatively charged beta particles (electrons) are represented as:

positively charged beta particles (positrons) are represented as:

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

50.23 i believe is correct but don't quote me on that.