Tin (II) fluoride, SnF2, is found in some toothpaste. Tin (II) fluoride is made by reacting solid tin with hydrogen fluroide according to the following BALANCED equation:

Sn (s) + 2 HF (g) → SnF2 (s) + H2 (g)

How many moles of tin are needed to react with 3.5 moles of hydrogen fluoride?
[pls its important]

The sum of two numbers is 58. the first number is 8 less than half the second number. let  c  represent the first number. let  drepresent the second number. which statements about solving for the two numbers are true? check all that apply.the equation    represents the sum of the two numbers.the equation    represents the sentence “the first number is 8 less than half the second number.”the equation    represents the relationship between the two numbers.the equation    represents the sum of the two numbers.the number  d  is 14.the number  c  is 44.the number  c  is 14.the number  d  is 44.

Nine more than four times a number is the same as one less than twice the number. find the number?

The volume of the sun is approximately 1 × 10^18 cu km, while the volume of jupiter is approximately 1 × 10^15 cu km. which of the following is true? a. the volume of jupiter is approximately one thousand times the volume of the sun. b. the volume of jupiter is approximately one hundred times the volume of the sun. c. the volume of the sun is approximately one thousand times the volume of jupiter. d. the volume of the sun is approximately one hundred times the volume of jupiter.