First, 2C6H8O7 is NOT an element it is a Compound.
Second the formula for the compound TELLS you how many atoms are present!
2C6H8O7 = Ignoring the element symbols is 2*(6+8+7)
2*(6+8+7)= 2*(21) = 42 Atoms
In 4CaCO3, there are a total of 4 calcium (Ca) atoms, 4 carbon (C) atoms, and 12 oxygen (O) atoms.
In 3H3PO4, there are 3 hydrogen atoms, 3 phosphorus atoms, 12 oxygen atoms, and 4 additional hydrogen atoms for a total of 19 atoms.
In 2Fe2O3, there are a total of 10 atoms: 4 iron atoms (2 x 2) and 6 oxygen atoms (2 x 3).
Mg(NO3)2 is magnesium nitrate and it is not an element, but is a compound. Each molecule has 1 Mg atom + 2 N atoms + 6 O atoms for a total of 9 atoms per molecule. The more molecules you have, the more atoms you have.
In 2H2SO4, there are a total of 2 sulfur (S) atoms, 8 hydrogen (H) atoms, and 4 oxygen (O) atoms. Each molecule contains 2 hydrogen atoms, so the total count is doubled from the molecular formula.
C8H12 8 Carbon atoms + 12 Hydrogen atoms = 20 atoms total
To determine the total number of atoms in the chemical formula Sq2R3, you need to consider the subscripts. The formula indicates there are 2 atoms of element Sq and 3 atoms of element R. Therefore, the total number of atoms is 2 (from Sq) + 3 (from R) = 5 atoms.
In 4CaCO3, there are a total of 4 calcium (Ca) atoms, 4 carbon (C) atoms, and 12 oxygen (O) atoms.
In 3H3PO4, there are 3 hydrogen atoms, 3 phosphorus atoms, 12 oxygen atoms, and 4 additional hydrogen atoms for a total of 19 atoms.
There are no "atoms in an element," but rather atoms OF an element. If you are trying to find the number of atoms in a sample of a pure element you divide its weight by its molar mass and then multiply by 6.022 x 10^23 to get the answer in atoms. The answer options are 2,3, or 4.
There are 21 atoms, because there are 9 atoms of Carbon 8 atoms of Hydrogen and 4 atoms of Oxygen.
In 2Fe2O3, there are a total of 10 atoms: 4 iron atoms (2 x 2) and 6 oxygen atoms (2 x 3).
Mg(NO3)2 is magnesium nitrate and it is not an element, but is a compound. Each molecule has 1 Mg atom + 2 N atoms + 6 O atoms for a total of 9 atoms per molecule. The more molecules you have, the more atoms you have.
In 2H2SO4, there are a total of 2 sulfur (S) atoms, 8 hydrogen (H) atoms, and 4 oxygen (O) atoms. Each molecule contains 2 hydrogen atoms, so the total count is doubled from the molecular formula.
Gold is the element gold no matter how many atoms of it you have.
There are 58 atoms in C18H32O18. This is calculated by adding up the total number of each element: 18 carbon atoms + 32 hydrogen atoms + 18 oxygen atoms.
In a molecule of NaOH, there is 1 atom of sodium (Na), 1 atom of oxygen (O), and 1 atom of hydrogen (H). So there are a total of 3 atoms in each element of NaOH.