Determine the number of significant figures in the measurement quantity: 6.010m^2

Our significant figures are 4

Explanation:

Our measure is 6.010 m²

Our significant figures are 4

1 significant figure before the decimal place → 6

3 significant figures after the decimal place 010

The significant figures in a measure are all the digits other than zero, the zeros that are located between different digits of zeros and the zeros that are to the right of a number different from zero

For example:

0.004 has 1 significant figure

0.40 has 2 significan figures

1.2 has 2 significant figures

1.02 has 3 significan figures

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