From which of the following do spiral galaxies form?
a. rapidly cooling protogalactic clouds
high-density protogalactic clouds
rapidly spinning protogalactic clouds
colliding/merging protogalactic clouds

as you go deeper into the ocean temperature decreases and pressure increases to much for a body to withstand

answer:

a) 2mg + ticl₄ ⟶ 2mgcl₂ + ti

b) 1.02 kg

step-by-step explanation:

a) balanced equation

we know we will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.  

m_r:     24.30                                 47.87

            2mg + ticl₄ ⟶ 2mgcl₂ + ti

m/kg:                                               1.00

b) mass of mg

(i) calculate the moles of ti

n = 1.00 kg ti   × (1 kmol ti /47.87 kg ti)

  = 0.020 89 kmol ti

(ii) calculate the moles of mg

the molar ratio is (2 kmol mg/1 kmol ti)

n = 0.020 89 kmol ti × (2 kmol mg/1 kmol ti)

  = 0.041 78 kmol mg

(iii) calculate the mass of mg

m = 0.041 78 kmol mg × (24.30 kg mg/1 kmol mg)

    = 1.02 kg mg

you need 1.02 kg mg to produce 1.00 kg ti.