25. Identify the element with 4 valence electrons and the least mass. Choices

Carbon (C)
Silicon (Si)
Germanium (Ge)
O Tin (Sn)

In which situation can a mixture always be called a solution

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.56 kg of fluorine. a second sample produced 1.32 kg of magnesium. part a how much fluorine (in grams) did the second sample produce?